}.
- *
- * @see #getPathStrategy(Context, String)
- */
- private static PathStrategy parsePathStrategy(Context context, String authority)
- throws IOException, XmlPullParserException {
- final SimplePathStrategy strat = new SimplePathStrategy(authority);
-
- final ProviderInfo info = context.getPackageManager()
- .resolveContentProvider(authority, PackageManager.GET_META_DATA);
- final XmlResourceParser in = info.loadXmlMetaData(
- context.getPackageManager(), META_DATA_FILE_PROVIDER_PATHS);
- if (in == null) {
- throw new IllegalArgumentException(
- "Missing " + META_DATA_FILE_PROVIDER_PATHS + " meta-data");
- }
-
- int type;
- while ((type = in.next()) != END_DOCUMENT) {
- if (type == START_TAG) {
- final String tag = in.getName();
-
- final String name = in.getAttributeValue(null, ATTR_NAME);
- String path = in.getAttributeValue(null, ATTR_PATH);
-
- File target = null;
- if (TAG_ROOT_PATH.equals(tag)) {
- target = buildPath(DEVICE_ROOT, path);
- } else if (TAG_FILES_PATH.equals(tag)) {
- target = buildPath(context.getFilesDir(), path);
- } else if (TAG_CACHE_PATH.equals(tag)) {
- target = buildPath(context.getCacheDir(), path);
- } else if (TAG_EXTERNAL.equals(tag)) {
- target = buildPath(Environment.getExternalStorageDirectory(), path);
- }
-
- if (target != null) {
- strat.addRoot(name, target);
- }
- }
- }
-
- return strat;
- }
-
- /**
- * Strategy for mapping between {@link File} and {@link Uri}.
- *
- * Strategies must be symmetric so that mapping a {@link File} to a
- * {@link Uri} and then back to a {@link File} points at the original
- * target.
- *
- * Strategies must remain consistent across app launches, and not rely on
- * dynamic state. This ensures that any generated {@link Uri} can still be
- * resolved if your process is killed and later restarted.
- *
- * @see SimplePathStrategy
- */
- interface PathStrategy {
- /**
- * Return a {@link Uri} that represents the given {@link File}.
- */
- public Uri getUriForFile(File file);
-
- /**
- * Return a {@link File} that represents the given {@link Uri}.
- */
- public File getFileForUri(Uri uri);
- }
-
- /**
- * Strategy that provides access to files living under a narrow whitelist of
- * filesystem roots. It will throw {@link SecurityException} if callers try
- * accessing files outside the configured roots.
- *
- * For example, if configured with
- * {@code addRoot("myfiles", context.getFilesDir())}, then
- * {@code context.getFileStreamPath("foo.txt")} would map to
- * {@code content://myauthority/myfiles/foo.txt}.
- */
- static class SimplePathStrategy implements PathStrategy {
- private final String mAuthority;
- private final HashMap mRoots = new HashMap();
-
- public SimplePathStrategy(String authority) {
- mAuthority = authority;
- }
-
- /**
- * Add a mapping from a name to a filesystem root. The provider only offers
- * access to files that live under configured roots.
- */
- public void addRoot(String name, File root) {
- if (TextUtils.isEmpty(name)) {
- throw new IllegalArgumentException("Name must not be empty");
- }
-
- try {
- // Resolve to canonical path to keep path checking fast
- root = root.getCanonicalFile();
- } catch (IOException e) {
- throw new IllegalArgumentException(
- "Failed to resolve canonical path for " + root, e);
- }
-
- mRoots.put(name, root);
- }
-
- @Override
- public Uri getUriForFile(File file) {
- String path;
- try {
- path = file.getCanonicalPath();
- } catch (IOException e) {
- throw new IllegalArgumentException("Failed to resolve canonical path for " + file);
- }
-
- // Find the most-specific root path
- Map.Entry mostSpecific = null;
- for (Map.Entry root : mRoots.entrySet()) {
- final String rootPath = root.getValue().getPath();
- if (path.startsWith(rootPath) && (mostSpecific == null
- || rootPath.length() > mostSpecific.getValue().getPath().length())) {
- mostSpecific = root;
- }
- }
-
- if (mostSpecific == null) {
- throw new IllegalArgumentException(
- "Failed to find configured root that contains " + path);
- }
-
- // Start at first char of path under root
- final String rootPath = mostSpecific.getValue().getPath();
- if (rootPath.endsWith("/")) {
- path = path.substring(rootPath.length());
- } else {
- path = path.substring(rootPath.length() + 1);
- }
-
- // Encode the tag and path separately
- path = Uri.encode(mostSpecific.getKey()) + '/' + Uri.encode(path, "/");
- return new Uri.Builder().scheme("content")
- .authority(mAuthority).encodedPath(path).build();
- }
-
- @Override
- public File getFileForUri(Uri uri) {
- String path = uri.getEncodedPath();
-
- final int splitIndex = path.indexOf('/', 1);
- final String tag = Uri.decode(path.substring(1, splitIndex));
- path = Uri.decode(path.substring(splitIndex + 1));
-
- final File root = mRoots.get(tag);
- if (root == null) {
- throw new IllegalArgumentException("Unable to find configured root for " + uri);
- }
-
- File file = new File(root, path);
- try {
- file = file.getCanonicalFile();
- } catch (IOException e) {
- throw new IllegalArgumentException("Failed to resolve canonical path for " + file);
- }
-
- if (!file.getPath().startsWith(root.getPath())) {
- throw new SecurityException("Resolved path jumped beyond configured root");
- }
-
- return file;
- }
- }
-
- /**
- * Copied from ContentResolver.java
- */
- private static int modeToMode(String mode) {
- int modeBits;
- if ("r".equals(mode)) {
- modeBits = ParcelFileDescriptor.MODE_READ_ONLY;
- } else if ("w".equals(mode) || "wt".equals(mode)) {
- modeBits = ParcelFileDescriptor.MODE_WRITE_ONLY
- | ParcelFileDescriptor.MODE_CREATE
- | ParcelFileDescriptor.MODE_TRUNCATE;
- } else if ("wa".equals(mode)) {
- modeBits = ParcelFileDescriptor.MODE_WRITE_ONLY
- | ParcelFileDescriptor.MODE_CREATE
- | ParcelFileDescriptor.MODE_APPEND;
- } else if ("rw".equals(mode)) {
- modeBits = ParcelFileDescriptor.MODE_READ_WRITE
- | ParcelFileDescriptor.MODE_CREATE;
- } else if ("rwt".equals(mode)) {
- modeBits = ParcelFileDescriptor.MODE_READ_WRITE
- | ParcelFileDescriptor.MODE_CREATE
- | ParcelFileDescriptor.MODE_TRUNCATE;
- } else {
- throw new IllegalArgumentException("Invalid mode: " + mode);
- }
- return modeBits;
- }
-
- private static File buildPath(File base, String... segments) {
- File cur = base;
- for (String segment : segments) {
- if (segment != null) {
- cur = new File(cur, segment);
- }
- }
- return cur;
- }
-
- private static String[] copyOf(String[] original, int newLength) {
- final String[] result = new String[newLength];
- System.arraycopy(original, 0, result, 0, newLength);
- return result;
- }
-
- private static Object[] copyOf(Object[] original, int newLength) {
- final Object[] result = new Object[newLength];
- System.arraycopy(original, 0, result, 0, newLength);
- return result;
- }
-}
diff --git a/app/src/main/java/android/support/v4/view/PagerAdapter.java b/app/src/main/java/android/support/v4/view/PagerAdapter.java
deleted file mode 100644
index ef524047..00000000
--- a/app/src/main/java/android/support/v4/view/PagerAdapter.java
+++ /dev/null
@@ -1,320 +0,0 @@
-/*
- * Copyright (C) 2011 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.support.v4.view;
-
-import android.database.DataSetObservable;
-import android.database.DataSetObserver;
-import android.os.Parcelable;
-import android.view.View;
-import android.view.ViewGroup;
-
-/**
- * Base class providing the adapter to populate pages inside of
- * a {@link ViewPager}. You will most likely want to use a more
- * specific implementation of this, such as
- * {@link android.support.v4.app.FragmentPagerAdapter} or
- * {@link android.support.v4.app.FragmentStatePagerAdapter}.
- *
- * When you implement a PagerAdapter, you must override the following methods
- * at minimum:
- *
- * - {@link #instantiateItem(ViewGroup, int)}
- * - {@link #destroyItem(ViewGroup, int, Object)}
- * - {@link #getCount()}
- * - {@link #isViewFromObject(View, Object)}
- *
- *
- * PagerAdapter is more general than the adapters used for
- * {@link android.widget.AdapterView AdapterViews}. Instead of providing a
- * View recycling mechanism directly ViewPager uses callbacks to indicate the
- * steps taken during an update. A PagerAdapter may implement a form of View
- * recycling if desired or use a more sophisticated method of managing page
- * Views such as Fragment transactions where each page is represented by its
- * own Fragment.
- *
- * ViewPager associates each page with a key Object instead of working with
- * Views directly. This key is used to track and uniquely identify a given page
- * independent of its position in the adapter. A call to the PagerAdapter method
- * {@link #startUpdate(ViewGroup)} indicates that the contents of the ViewPager
- * are about to change. One or more calls to {@link #instantiateItem(ViewGroup, int)}
- * and/or {@link #destroyItem(ViewGroup, int, Object)} will follow, and the end
- * of an update will be signaled by a call to {@link #finishUpdate(ViewGroup)}.
- * By the time {@link #finishUpdate(ViewGroup) finishUpdate} returns the views
- * associated with the key objects returned by
- * {@link #instantiateItem(ViewGroup, int) instantiateItem} should be added to
- * the parent ViewGroup passed to these methods and the views associated with
- * the keys passed to {@link #destroyItem(ViewGroup, int, Object) destroyItem}
- * should be removed. The method {@link #isViewFromObject(View, Object)} identifies
- * whether a page View is associated with a given key object.
- *
- * A very simple PagerAdapter may choose to use the page Views themselves
- * as key objects, returning them from {@link #instantiateItem(ViewGroup, int)}
- * after creation and adding them to the parent ViewGroup. A matching
- * {@link #destroyItem(ViewGroup, int, Object)} implementation would remove the
- * View from the parent ViewGroup and {@link #isViewFromObject(View, Object)}
- * could be implemented as return view == object;.
- *
- * PagerAdapter supports data set changes. Data set changes must occur on the
- * main thread and must end with a call to {@link #notifyDataSetChanged()} similar
- * to AdapterView adapters derived from {@link android.widget.BaseAdapter}. A data
- * set change may involve pages being added, removed, or changing position. The
- * ViewPager will keep the current page active provided the adapter implements
- * the method {@link #getItemPosition(Object)}.
- */
-public abstract class PagerAdapter {
- private DataSetObservable mObservable = new DataSetObservable();
-
- public static final int POSITION_UNCHANGED = -1;
- public static final int POSITION_NONE = -2;
-
- /**
- * Return the number of views available.
- */
- public abstract int getCount();
-
- /**
- * Called when a change in the shown pages is going to start being made.
- * @param container The containing View which is displaying this adapter's
- * page views.
- */
- public void startUpdate(ViewGroup container) {
- startUpdate((View) container);
- }
-
- /**
- * Create the page for the given position. The adapter is responsible
- * for adding the view to the container given here, although it only
- * must ensure this is done by the time it returns from
- * {@link #finishUpdate(ViewGroup)}.
- *
- * @param container The containing View in which the page will be shown.
- * @param position The page position to be instantiated.
- * @return Returns an Object representing the new page. This does not
- * need to be a View, but can be some other container of the page.
- */
- public Object instantiateItem(ViewGroup container, int position) {
- return instantiateItem((View) container, position);
- }
-
- /**
- * Remove a page for the given position. The adapter is responsible
- * for removing the view from its container, although it only must ensure
- * this is done by the time it returns from {@link #finishUpdate(ViewGroup)}.
- *
- * @param container The containing View from which the page will be removed.
- * @param position The page position to be removed.
- * @param object The same object that was returned by
- * {@link #instantiateItem(View, int)}.
- */
- public void destroyItem(ViewGroup container, int position, Object object) {
- destroyItem((View) container, position, object);
- }
-
- /**
- * Called to inform the adapter of which item is currently considered to
- * be the "primary", that is the one show to the user as the current page.
- *
- * @param container The containing View from which the page will be removed.
- * @param position The page position that is now the primary.
- * @param object The same object that was returned by
- * {@link #instantiateItem(View, int)}.
- */
- public void setPrimaryItem(ViewGroup container, int position, Object object) {
- setPrimaryItem((View) container, position, object);
- }
-
- /**
- * Called when the a change in the shown pages has been completed. At this
- * point you must ensure that all of the pages have actually been added or
- * removed from the container as appropriate.
- * @param container The containing View which is displaying this adapter's
- * page views.
- */
- public void finishUpdate(ViewGroup container) {
- finishUpdate((View) container);
- }
-
- /**
- * Called when a change in the shown pages is going to start being made.
- * @param container The containing View which is displaying this adapter's
- * page views.
- *
- * @deprecated Use {@link #startUpdate(ViewGroup)}
- */
- public void startUpdate(View container) {
- }
-
- /**
- * Create the page for the given position. The adapter is responsible
- * for adding the view to the container given here, although it only
- * must ensure this is done by the time it returns from
- * {@link #finishUpdate(ViewGroup)}.
- *
- * @param container The containing View in which the page will be shown.
- * @param position The page position to be instantiated.
- * @return Returns an Object representing the new page. This does not
- * need to be a View, but can be some other container of the page.
- *
- * @deprecated Use {@link #instantiateItem(ViewGroup, int)}
- */
- public Object instantiateItem(View container, int position) {
- throw new UnsupportedOperationException(
- "Required method instantiateItem was not overridden");
- }
-
- /**
- * Remove a page for the given position. The adapter is responsible
- * for removing the view from its container, although it only must ensure
- * this is done by the time it returns from {@link #finishUpdate(View)}.
- *
- * @param container The containing View from which the page will be removed.
- * @param position The page position to be removed.
- * @param object The same object that was returned by
- * {@link #instantiateItem(View, int)}.
- *
- * @deprecated Use {@link #destroyItem(ViewGroup, int, Object)}
- */
- public void destroyItem(View container, int position, Object object) {
- throw new UnsupportedOperationException("Required method destroyItem was not overridden");
- }
-
- /**
- * Called to inform the adapter of which item is currently considered to
- * be the "primary", that is the one show to the user as the current page.
- *
- * @param container The containing View from which the page will be removed.
- * @param position The page position that is now the primary.
- * @param object The same object that was returned by
- * {@link #instantiateItem(View, int)}.
- *
- * @deprecated Use {@link #setPrimaryItem(ViewGroup, int, Object)}
- */
- public void setPrimaryItem(View container, int position, Object object) {
- }
-
- /**
- * Called when the a change in the shown pages has been completed. At this
- * point you must ensure that all of the pages have actually been added or
- * removed from the container as appropriate.
- * @param container The containing View which is displaying this adapter's
- * page views.
- *
- * @deprecated Use {@link #finishUpdate(ViewGroup)}
- */
- public void finishUpdate(View container) {
- }
-
- /**
- * Determines whether a page View is associated with a specific key object
- * as returned by {@link #instantiateItem(ViewGroup, int)}. This method is
- * required for a PagerAdapter to function properly.
- *
- * @param view Page View to check for association with object
- * @param object Object to check for association with view
- * @return true if view is associated with the key object object
- */
- public abstract boolean isViewFromObject(View view, Object object);
-
- /**
- * Save any instance state associated with this adapter and its pages that should be
- * restored if the current UI state needs to be reconstructed.
- *
- * @return Saved state for this adapter
- */
- public Parcelable saveState() {
- return null;
- }
-
- /**
- * Restore any instance state associated with this adapter and its pages
- * that was previously saved by {@link #saveState()}.
- *
- * @param state State previously saved by a call to {@link #saveState()}
- * @param loader A ClassLoader that should be used to instantiate any restored objects
- */
- public void restoreState(Parcelable state, ClassLoader loader) {
- }
-
- /**
- * Called when the host view is attempting to determine if an item's position
- * has changed. Returns {@link #POSITION_UNCHANGED} if the position of the given
- * item has not changed or {@link #POSITION_NONE} if the item is no longer present
- * in the adapter.
- *
- * The default implementation assumes that items will never
- * change position and always returns {@link #POSITION_UNCHANGED}.
- *
- * @param object Object representing an item, previously returned by a call to
- * {@link #instantiateItem(View, int)}.
- * @return object's new position index from [0, {@link #getCount()}),
- * {@link #POSITION_UNCHANGED} if the object's position has not changed,
- * or {@link #POSITION_NONE} if the item is no longer present.
- */
- public int getItemPosition(Object object) {
- return POSITION_UNCHANGED;
- }
-
- /**
- * This method should be called by the application if the data backing this adapter has changed
- * and associated views should update.
- */
- public void notifyDataSetChanged() {
- mObservable.notifyChanged();
- }
-
- /**
- * Register an observer to receive callbacks related to the adapter's data changing.
- *
- * @param observer The {@link android.database.DataSetObserver} which will receive callbacks.
- */
- public void registerDataSetObserver(DataSetObserver observer) {
- mObservable.registerObserver(observer);
- }
-
- /**
- * Unregister an observer from callbacks related to the adapter's data changing.
- *
- * @param observer The {@link android.database.DataSetObserver} which will be unregistered.
- */
- public void unregisterDataSetObserver(DataSetObserver observer) {
- mObservable.unregisterObserver(observer);
- }
-
- /**
- * This method may be called by the ViewPager to obtain a title string
- * to describe the specified page. This method may return null
- * indicating no title for this page. The default implementation returns
- * null.
- *
- * @param position The position of the title requested
- * @return A title for the requested page
- */
- public CharSequence getPageTitle(int position) {
- return null;
- }
-
- /**
- * Returns the proportional width of a given page as a percentage of the
- * ViewPager's measured width from (0.f-1.f]
- *
- * @param position The position of the page requested
- * @return Proportional width for the given page position
- */
- public float getPageWidth(int position) {
- return 1.f;
- }
-}
diff --git a/app/src/main/java/android/support/v4/view/ViewPager.java b/app/src/main/java/android/support/v4/view/ViewPager.java
deleted file mode 100644
index 1fb488af..00000000
--- a/app/src/main/java/android/support/v4/view/ViewPager.java
+++ /dev/null
@@ -1,2975 +0,0 @@
-/*
- * Copyright (C) 2011 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.support.v4.view;
-
-import android.content.Context;
-import android.content.res.Resources;
-import android.content.res.TypedArray;
-import android.database.DataSetObserver;
-import android.graphics.Canvas;
-import android.graphics.Rect;
-import android.graphics.drawable.Drawable;
-import android.os.Build;
-import android.os.Bundle;
-import android.os.Parcel;
-import android.os.Parcelable;
-import android.os.SystemClock;
-import android.util.AttributeSet;
-import android.util.Log;
-import android.view.FocusFinder;
-import android.view.Gravity;
-import android.view.KeyEvent;
-import android.view.MotionEvent;
-import android.view.SoundEffectConstants;
-import android.view.VelocityTracker;
-import android.view.View;
-import android.view.ViewConfiguration;
-import android.view.ViewGroup;
-import android.view.ViewParent;
-import android.view.accessibility.AccessibilityEvent;
-import android.view.animation.Interpolator;
-import android.widget.Scroller;
-
-import android.view.MotionEvent;
-import android.widget.EdgeEffect;
-import android.view.View.AccessibilityDelegate;
-import android.view.accessibility.AccessibilityEvent;
-import android.view.accessibility.AccessibilityNodeInfo;
-import android.view.accessibility.AccessibilityRecord;
-
-import java.lang.reflect.Method;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.List;
-
-/**
- * Layout manager that allows the user to flip left and right
- * through pages of data. You supply an implementation of a
- * {@link PagerAdapter} to generate the pages that the view shows.
- *
- *
Note this class is currently under early design and
- * development. The API will likely change in later updates of
- * the compatibility library, requiring changes to the source code
- * of apps when they are compiled against the newer version.
- *
- * ViewPager is most often used in conjunction with {@link android.app.Fragment},
- * which is a convenient way to supply and manage the lifecycle of each page.
- * There are standard adapters implemented for using fragments with the ViewPager,
- * which cover the most common use cases. These are
- * {@link android.support.v4.app.FragmentPagerAdapter} and
- * {@link android.support.v4.app.FragmentStatePagerAdapter}; each of these
- * classes have simple code showing how to build a full user interface
- * with them.
- *
- *
For more information about how to use ViewPager, read Creating Swipe Views with
- * Tabs.
- *
- * Below is a more complicated example of ViewPager, using it in conjunction
- * with {@link android.app.ActionBar} tabs. You can find other examples of using
- * ViewPager in the API 4+ Support Demos and API 13+ Support Demos sample code.
- *
- * {@sample development/samples/Support13Demos/src/com/example/android/supportv13/app/ActionBarTabsPager.java
- * complete}
- */
-public class ViewPager extends ViewGroup {
- private static final String TAG = "ViewPager";
- private static final boolean DEBUG = false;
-
- private static final boolean USE_CACHE = false;
-
- private static final int DEFAULT_OFFSCREEN_PAGES = 1;
- private static final int MAX_SETTLE_DURATION = 600; // ms
- private static final int MIN_DISTANCE_FOR_FLING = 25; // dips
-
- private static final int DEFAULT_GUTTER_SIZE = 16; // dips
-
- private static final int MIN_FLING_VELOCITY = 400; // dips
-
- private static final int[] LAYOUT_ATTRS = new int[] {
- android.R.attr.layout_gravity
- };
-
- /**
- * Used to track what the expected number of items in the adapter should be.
- * If the app changes this when we don't expect it, we'll throw a big obnoxious exception.
- */
- private int mExpectedAdapterCount;
-
- static class ItemInfo {
- Object object;
- int position;
- boolean scrolling;
- float widthFactor;
- float offset;
- }
-
- private static final Comparator COMPARATOR = new Comparator(){
- @Override
- public int compare(ItemInfo lhs, ItemInfo rhs) {
- return lhs.position - rhs.position;
- }
- };
-
- private static final Interpolator sInterpolator = new Interpolator() {
- public float getInterpolation(float t) {
- t -= 1.0f;
- return t * t * t * t * t + 1.0f;
- }
- };
-
- private final ArrayList mItems = new ArrayList();
- private final ItemInfo mTempItem = new ItemInfo();
-
- private final Rect mTempRect = new Rect();
-
- private PagerAdapter mAdapter;
- private int mCurItem; // Index of currently displayed page.
- private int mRestoredCurItem = -1;
- private Parcelable mRestoredAdapterState = null;
- private ClassLoader mRestoredClassLoader = null;
- private Scroller mScroller;
- private PagerObserver mObserver;
-
- private int mPageMargin;
- private Drawable mMarginDrawable;
- private int mTopPageBounds;
- private int mBottomPageBounds;
-
- // Offsets of the first and last items, if known.
- // Set during population, used to determine if we are at the beginning
- // or end of the pager data set during touch scrolling.
- private float mFirstOffset = -Float.MAX_VALUE;
- private float mLastOffset = Float.MAX_VALUE;
-
- private int mChildWidthMeasureSpec;
- private int mChildHeightMeasureSpec;
- private boolean mInLayout;
-
- private boolean mScrollingCacheEnabled;
-
- private boolean mPopulatePending;
- private int mOffscreenPageLimit = DEFAULT_OFFSCREEN_PAGES;
-
- private boolean mIsBeingDragged;
- private boolean mIsUnableToDrag;
- private int mDefaultGutterSize;
- private int mGutterSize;
- private int mTouchSlop;
- /**
- * Position of the last motion event.
- */
- private float mLastMotionX;
- private float mLastMotionY;
- private float mInitialMotionX;
- private float mInitialMotionY;
- /**
- * ID of the active pointer. This is used to retain consistency during
- * drags/flings if multiple pointers are used.
- */
- private int mActivePointerId = INVALID_POINTER;
- /**
- * Sentinel value for no current active pointer.
- * Used by {@link #mActivePointerId}.
- */
- private static final int INVALID_POINTER = -1;
-
- /**
- * Determines speed during touch scrolling
- */
- private VelocityTracker mVelocityTracker;
- private int mMinimumVelocity;
- private int mMaximumVelocity;
- private int mFlingDistance;
- private int mCloseEnough;
-
- // If the pager is at least this close to its final position, complete the scroll
- // on touch down and let the user interact with the content inside instead of
- // "catching" the flinging pager.
- private static final int CLOSE_ENOUGH = 2; // dp
-
- private boolean mFakeDragging;
- private long mFakeDragBeginTime;
-
- private EdgeEffect mLeftEdge;
- private EdgeEffect mRightEdge;
-
- private boolean mFirstLayout = true;
- private boolean mNeedCalculatePageOffsets = false;
- private boolean mCalledSuper;
- private int mDecorChildCount;
-
- private List mOnPageChangeListeners;
- private OnPageChangeListener mOnPageChangeListener;
- private OnPageChangeListener mInternalPageChangeListener;
- private OnAdapterChangeListener mAdapterChangeListener;
- private PageTransformer mPageTransformer;
- private Method mSetChildrenDrawingOrderEnabled;
-
- private static final int DRAW_ORDER_DEFAULT = 0;
- private static final int DRAW_ORDER_FORWARD = 1;
- private static final int DRAW_ORDER_REVERSE = 2;
- private int mDrawingOrder;
- private ArrayList mDrawingOrderedChildren;
- private static final ViewPositionComparator sPositionComparator = new ViewPositionComparator();
-
- /**
- * Indicates that the pager is in an idle, settled state. The current page
- * is fully in view and no animation is in progress.
- */
- public static final int SCROLL_STATE_IDLE = 0;
-
- /**
- * Indicates that the pager is currently being dragged by the user.
- */
- public static final int SCROLL_STATE_DRAGGING = 1;
-
- /**
- * Indicates that the pager is in the process of settling to a final position.
- */
- public static final int SCROLL_STATE_SETTLING = 2;
-
- private final Runnable mEndScrollRunnable = new Runnable() {
- public void run() {
- setScrollState(SCROLL_STATE_IDLE);
- populate();
- }
- };
-
- private int mScrollState = SCROLL_STATE_IDLE;
-
- /**
- * Callback interface for responding to changing state of the selected page.
- */
- public interface OnPageChangeListener {
-
- /**
- * This method will be invoked when the current page is scrolled, either as part
- * of a programmatically initiated smooth scroll or a user initiated touch scroll.
- *
- * @param position Position index of the first page currently being displayed.
- * Page position+1 will be visible if positionOffset is nonzero.
- * @param positionOffset Value from [0, 1) indicating the offset from the page at position.
- * @param positionOffsetPixels Value in pixels indicating the offset from position.
- */
- public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels);
-
- /**
- * This method will be invoked when a new page becomes selected. Animation is not
- * necessarily complete.
- *
- * @param position Position index of the new selected page.
- */
- public void onPageSelected(int position);
-
- /**
- * Called when the scroll state changes. Useful for discovering when the user
- * begins dragging, when the pager is automatically settling to the current page,
- * or when it is fully stopped/idle.
- *
- * @param state The new scroll state.
- * @see ViewPager#SCROLL_STATE_IDLE
- * @see ViewPager#SCROLL_STATE_DRAGGING
- * @see ViewPager#SCROLL_STATE_SETTLING
- */
- public void onPageScrollStateChanged(int state);
- }
-
- /**
- * Simple implementation of the {@link OnPageChangeListener} interface with stub
- * implementations of each method. Extend this if you do not intend to override
- * every method of {@link OnPageChangeListener}.
- */
- public static class SimpleOnPageChangeListener implements OnPageChangeListener {
- @Override
- public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
- // This space for rent
- }
-
- @Override
- public void onPageSelected(int position) {
- // This space for rent
- }
-
- @Override
- public void onPageScrollStateChanged(int state) {
- // This space for rent
- }
- }
-
- /**
- * A PageTransformer is invoked whenever a visible/attached page is scrolled.
- * This offers an opportunity for the application to apply a custom transformation
- * to the page views using animation properties.
- *
- * As property animation is only supported as of Android 3.0 and forward,
- * setting a PageTransformer on a ViewPager on earlier platform versions will
- * be ignored.
- */
- public interface PageTransformer {
- /**
- * Apply a property transformation to the given page.
- *
- * @param page Apply the transformation to this page
- * @param position Position of page relative to the current front-and-center
- * position of the pager. 0 is front and center. 1 is one full
- * page position to the right, and -1 is one page position to the left.
- */
- public void transformPage(View page, float position);
- }
-
- /**
- * Used internally to monitor when adapters are switched.
- */
- interface OnAdapterChangeListener {
- public void onAdapterChanged(PagerAdapter oldAdapter, PagerAdapter newAdapter);
- }
-
- /**
- * Used internally to tag special types of child views that should be added as
- * pager decorations by default.
- */
- interface Decor {}
-
- public ViewPager(Context context) {
- super(context);
- initViewPager();
- }
-
- public ViewPager(Context context, AttributeSet attrs) {
- super(context, attrs);
- initViewPager();
- }
-
- void initViewPager() {
- setWillNotDraw(false);
- setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
- setFocusable(true);
- final Context context = getContext();
- mScroller = new Scroller(context, sInterpolator);
- final ViewConfiguration configuration = ViewConfiguration.get(context);
- final float density = context.getResources().getDisplayMetrics().density;
-
- mTouchSlop = configuration.getScaledPagingTouchSlop();
- mMinimumVelocity = (int) (MIN_FLING_VELOCITY * density);
- mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
- mLeftEdge = new EdgeEffect(context);
- mRightEdge = new EdgeEffect(context);
-
- mFlingDistance = (int) (MIN_DISTANCE_FOR_FLING * density);
- mCloseEnough = (int) (CLOSE_ENOUGH * density);
- mDefaultGutterSize = (int) (DEFAULT_GUTTER_SIZE * density);
-
- this.setAccessibilityDelegate(new MyAccessibilityDelegate());
-
- if (ViewPagerIcsCompat.getImportantForAccessibility(this)
- == View.IMPORTANT_FOR_ACCESSIBILITY_AUTO && Build.VERSION.SDK_INT >= 16) {
- this.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
- }
- }
-
- @Override
- protected void onDetachedFromWindow() {
- removeCallbacks(mEndScrollRunnable);
- super.onDetachedFromWindow();
- }
-
- private void setScrollState(int newState) {
- if (mScrollState == newState) {
- return;
- }
-
- mScrollState = newState;
- if (mPageTransformer != null) {
- // PageTransformers can do complex things that benefit from hardware layers.
- enableLayers(newState != SCROLL_STATE_IDLE);
- }
- dispatchOnScrollStateChanged(newState);
- }
-
- /**
- * Set a PagerAdapter that will supply views for this pager as needed.
- *
- * @param adapter Adapter to use
- */
- public void setAdapter(PagerAdapter adapter) {
- if (mAdapter != null) {
- mAdapter.unregisterDataSetObserver(mObserver);
- mAdapter.startUpdate(this);
- for (int i = 0; i < mItems.size(); i++) {
- final ItemInfo ii = mItems.get(i);
- mAdapter.destroyItem(this, ii.position, ii.object);
- }
- mAdapter.finishUpdate(this);
- mItems.clear();
- removeNonDecorViews();
- mCurItem = 0;
- scrollTo(0, 0);
- }
-
- final PagerAdapter oldAdapter = mAdapter;
- mAdapter = adapter;
- mExpectedAdapterCount = 0;
-
- if (mAdapter != null) {
- if (mObserver == null) {
- mObserver = new PagerObserver();
- }
- mAdapter.registerDataSetObserver(mObserver);
- mPopulatePending = false;
- final boolean wasFirstLayout = mFirstLayout;
- mFirstLayout = true;
- mExpectedAdapterCount = mAdapter.getCount();
- if (mRestoredCurItem >= 0) {
- mAdapter.restoreState(mRestoredAdapterState, mRestoredClassLoader);
- setCurrentItemInternal(mRestoredCurItem, false, true);
- mRestoredCurItem = -1;
- mRestoredAdapterState = null;
- mRestoredClassLoader = null;
- } else if (!wasFirstLayout) {
- populate();
- } else {
- requestLayout();
- }
- }
-
- if (mAdapterChangeListener != null && oldAdapter != adapter) {
- mAdapterChangeListener.onAdapterChanged(oldAdapter, adapter);
- }
- }
-
- private void removeNonDecorViews() {
- for (int i = 0; i < getChildCount(); i++) {
- final View child = getChildAt(i);
- final LayoutParams lp = (LayoutParams) child.getLayoutParams();
- if (!lp.isDecor) {
- removeViewAt(i);
- i--;
- }
- }
- }
-
- /**
- * Retrieve the current adapter supplying pages.
- *
- * @return The currently registered PagerAdapter
- */
- public PagerAdapter getAdapter() {
- return mAdapter;
- }
-
- void setOnAdapterChangeListener(OnAdapterChangeListener listener) {
- mAdapterChangeListener = listener;
- }
-
- private int getClientWidth() {
- return getMeasuredWidth() - getPaddingLeft() - getPaddingRight();
- }
-
- /**
- * Set the currently selected page. If the ViewPager has already been through its first
- * layout with its current adapter there will be a smooth animated transition between
- * the current item and the specified item.
- *
- * @param item Item index to select
- */
- public void setCurrentItem(int item) {
- mPopulatePending = false;
- setCurrentItemInternal(item, !mFirstLayout, false);
- }
-
- /**
- * Set the currently selected page.
- *
- * @param item Item index to select
- * @param smoothScroll True to smoothly scroll to the new item, false to transition immediately
- */
- public void setCurrentItem(int item, boolean smoothScroll) {
- mPopulatePending = false;
- setCurrentItemInternal(item, smoothScroll, false);
- }
-
- public int getCurrentItem() {
- return mCurItem;
- }
-
- void setCurrentItemInternal(int item, boolean smoothScroll, boolean always) {
- setCurrentItemInternal(item, smoothScroll, always, 0);
- }
-
- void setCurrentItemInternal(int item, boolean smoothScroll, boolean always, int velocity) {
- if (mAdapter == null || mAdapter.getCount() <= 0) {
- setScrollingCacheEnabled(false);
- return;
- }
- if (!always && mCurItem == item && mItems.size() != 0) {
- setScrollingCacheEnabled(false);
- return;
- }
-
- if (item < 0) {
- item = 0;
- } else if (item >= mAdapter.getCount()) {
- item = mAdapter.getCount() - 1;
- }
- final int pageLimit = mOffscreenPageLimit;
- if (item > (mCurItem + pageLimit) || item < (mCurItem - pageLimit)) {
- // We are doing a jump by more than one page. To avoid
- // glitches, we want to keep all current pages in the view
- // until the scroll ends.
- for (int i=0; iComponents that add a listener should take care to remove it when finished.
- * Other components that take ownership of a view may call {@link #clearOnPageChangeListeners()}
- * to remove all attached listeners.
- *
- * @param listener listener to add
- */
- public void addOnPageChangeListener(OnPageChangeListener listener) {
- if (mOnPageChangeListeners == null) {
- mOnPageChangeListeners = new ArrayList<>();
- }
- mOnPageChangeListeners.add(listener);
- }
-
- /**
- * Remove a listener that was previously added via
- * {@link #addOnPageChangeListener(OnPageChangeListener)}.
- *
- * @param listener listener to remove
- */
- public void removeOnPageChangeListener(OnPageChangeListener listener) {
- if (mOnPageChangeListeners != null) {
- mOnPageChangeListeners.remove(listener);
- }
- }
-
- /**
- * Remove all listeners that are notified of any changes in scroll state or position.
- */
- public void clearOnPageChangeListeners() {
- if (mOnPageChangeListeners != null) {
- mOnPageChangeListeners.clear();
- }
- }
-
- /**
- * Set a {@link PageTransformer} that will be called for each attached page whenever
- * the scroll position is changed. This allows the application to apply custom property
- * transformations to each page, overriding the default sliding look and feel.
- *
- * Note: Prior to Android 3.0 the property animation APIs did not exist.
- * As a result, setting a PageTransformer prior to Android 3.0 (API 11) will have no effect.
- *
- * @param reverseDrawingOrder true if the supplied PageTransformer requires page views
- * to be drawn from last to first instead of first to last.
- * @param transformer PageTransformer that will modify each page's animation properties
- */
- public void setPageTransformer(boolean reverseDrawingOrder, PageTransformer transformer) {
- if (Build.VERSION.SDK_INT >= 11) {
- final boolean hasTransformer = transformer != null;
- final boolean needsPopulate = hasTransformer != (mPageTransformer != null);
- mPageTransformer = transformer;
- setChildrenDrawingOrderEnabledCompat(hasTransformer);
- if (hasTransformer) {
- mDrawingOrder = reverseDrawingOrder ? DRAW_ORDER_REVERSE : DRAW_ORDER_FORWARD;
- } else {
- mDrawingOrder = DRAW_ORDER_DEFAULT;
- }
- if (needsPopulate) populate();
- }
- }
-
- void setChildrenDrawingOrderEnabledCompat(boolean enable) {
- if (Build.VERSION.SDK_INT >= 7) {
- if (mSetChildrenDrawingOrderEnabled == null) {
- try {
- mSetChildrenDrawingOrderEnabled = ViewGroup.class.getDeclaredMethod(
- "setChildrenDrawingOrderEnabled", new Class[] { Boolean.TYPE });
- } catch (NoSuchMethodException e) {
- Log.e(TAG, "Can't find setChildrenDrawingOrderEnabled", e);
- }
- }
- try {
- mSetChildrenDrawingOrderEnabled.invoke(this, enable);
- } catch (Exception e) {
- Log.e(TAG, "Error changing children drawing order", e);
- }
- }
- }
-
- @Override
- protected int getChildDrawingOrder(int childCount, int i) {
- final int index = mDrawingOrder == DRAW_ORDER_REVERSE ? childCount - 1 - i : i;
- final int result = ((LayoutParams) mDrawingOrderedChildren.get(index).getLayoutParams()).childIndex;
- return result;
- }
-
- /**
- * Set a separate OnPageChangeListener for internal use by the support library.
- *
- * @param listener Listener to set
- * @return The old listener that was set, if any.
- */
- OnPageChangeListener setInternalPageChangeListener(OnPageChangeListener listener) {
- OnPageChangeListener oldListener = mInternalPageChangeListener;
- mInternalPageChangeListener = listener;
- return oldListener;
- }
-
- /**
- * Returns the number of pages that will be retained to either side of the
- * current page in the view hierarchy in an idle state. Defaults to 1.
- *
- * @return How many pages will be kept offscreen on either side
- * @see #setOffscreenPageLimit(int)
- */
- public int getOffscreenPageLimit() {
- return mOffscreenPageLimit;
- }
-
- /**
- * Set the number of pages that should be retained to either side of the
- * current page in the view hierarchy in an idle state. Pages beyond this
- * limit will be recreated from the adapter when needed.
- *
- * This is offered as an optimization. If you know in advance the number
- * of pages you will need to support or have lazy-loading mechanisms in place
- * on your pages, tweaking this setting can have benefits in perceived smoothness
- * of paging animations and interaction. If you have a small number of pages (3-4)
- * that you can keep active all at once, less time will be spent in layout for
- * newly created view subtrees as the user pages back and forth.
- *
- * You should keep this limit low, especially if your pages have complex layouts.
- * This setting defaults to 1.
- *
- * @param limit How many pages will be kept offscreen in an idle state.
- */
- public void setOffscreenPageLimit(int limit) {
- if (limit < DEFAULT_OFFSCREEN_PAGES) {
- Log.w(TAG, "Requested offscreen page limit " + limit + " too small; defaulting to " +
- DEFAULT_OFFSCREEN_PAGES);
- limit = DEFAULT_OFFSCREEN_PAGES;
- }
- if (limit != mOffscreenPageLimit) {
- mOffscreenPageLimit = limit;
- populate();
- }
- }
-
- /**
- * Set the margin between pages.
- *
- * @param marginPixels Distance between adjacent pages in pixels
- * @see #getPageMargin()
- * @see #setPageMarginDrawable(Drawable)
- * @see #setPageMarginDrawable(int)
- */
- public void setPageMargin(int marginPixels) {
- final int oldMargin = mPageMargin;
- mPageMargin = marginPixels;
-
- final int width = getWidth();
- recomputeScrollPosition(width, width, marginPixels, oldMargin);
-
- requestLayout();
- }
-
- /**
- * Return the margin between pages.
- *
- * @return The size of the margin in pixels
- */
- public int getPageMargin() {
- return mPageMargin;
- }
-
- /**
- * Set a drawable that will be used to fill the margin between pages.
- *
- * @param d Drawable to display between pages
- */
- public void setPageMarginDrawable(Drawable d) {
- mMarginDrawable = d;
- if (d != null) refreshDrawableState();
- setWillNotDraw(d == null);
- invalidate();
- }
-
- /**
- * Set a drawable that will be used to fill the margin between pages.
- *
- * @param resId Resource ID of a drawable to display between pages
- */
- public void setPageMarginDrawable(int resId) {
- setPageMarginDrawable(getContext().getResources().getDrawable(resId));
- }
-
- @Override
- protected boolean verifyDrawable(Drawable who) {
- return super.verifyDrawable(who) || who == mMarginDrawable;
- }
-
- @Override
- protected void drawableStateChanged() {
- super.drawableStateChanged();
- final Drawable d = mMarginDrawable;
- if (d != null && d.isStateful()) {
- d.setState(getDrawableState());
- }
- }
-
- // We want the duration of the page snap animation to be influenced by the distance that
- // the screen has to travel, however, we don't want this duration to be effected in a
- // purely linear fashion. Instead, we use this method to moderate the effect that the distance
- // of travel has on the overall snap duration.
- float distanceInfluenceForSnapDuration(float f) {
- f -= 0.5f; // center the values about 0.
- f *= 0.3f * Math.PI / 2.0f;
- return (float) Math.sin(f);
- }
-
- /**
- * Like {@link View#scrollBy}, but scroll smoothly instead of immediately.
- *
- * @param x the number of pixels to scroll by on the X axis
- * @param y the number of pixels to scroll by on the Y axis
- */
- void smoothScrollTo(int x, int y) {
- smoothScrollTo(x, y, 0);
- }
-
- /**
- * Like {@link View#scrollBy}, but scroll smoothly instead of immediately.
- *
- * @param x the number of pixels to scroll by on the X axis
- * @param y the number of pixels to scroll by on the Y axis
- * @param velocity the velocity associated with a fling, if applicable. (0 otherwise)
- */
- void smoothScrollTo(int x, int y, int velocity) {
- if (getChildCount() == 0) {
- // Nothing to do.
- setScrollingCacheEnabled(false);
- return;
- }
- int sx = getScrollX();
- int sy = getScrollY();
- int dx = x - sx;
- int dy = y - sy;
- if (dx == 0 && dy == 0) {
- completeScroll(false);
- populate();
- setScrollState(SCROLL_STATE_IDLE);
- return;
- }
-
- setScrollingCacheEnabled(true);
- setScrollState(SCROLL_STATE_SETTLING);
-
- final int width = getClientWidth();
- final int halfWidth = width / 2;
- final float distanceRatio = Math.min(1f, 1.0f * Math.abs(dx) / width);
- final float distance = halfWidth + halfWidth *
- distanceInfluenceForSnapDuration(distanceRatio);
-
- int duration = 0;
- velocity = Math.abs(velocity);
- if (velocity > 0) {
- duration = 4 * Math.round(1000 * Math.abs(distance / velocity));
- } else {
- final float pageWidth = width * mAdapter.getPageWidth(mCurItem);
- final float pageDelta = (float) Math.abs(dx) / (pageWidth + mPageMargin);
- duration = (int) ((pageDelta + 1) * 100);
- }
- duration = Math.min(duration, MAX_SETTLE_DURATION);
-
- mScroller.startScroll(sx, sy, dx, dy, duration);
- ViewPagerIcsCompat.postInvalidateOnAnimation(this);
- }
-
- ItemInfo addNewItem(int position, int index) {
- ItemInfo ii = new ItemInfo();
- ii.position = position;
- ii.object = mAdapter.instantiateItem(this, position);
- ii.widthFactor = mAdapter.getPageWidth(position);
- if (index < 0 || index >= mItems.size()) {
- mItems.add(ii);
- } else {
- mItems.add(index, ii);
- }
- return ii;
- }
-
- void dataSetChanged() {
- // This method only gets called if our observer is attached, so mAdapter is non-null.
-
- final int adapterCount = mAdapter.getCount();
- mExpectedAdapterCount = adapterCount;
- boolean needPopulate = mItems.size() < mOffscreenPageLimit * 2 + 1 &&
- mItems.size() < adapterCount;
- int newCurrItem = mCurItem;
-
- boolean isUpdating = false;
- for (int i = 0; i < mItems.size(); i++) {
- final ItemInfo ii = mItems.get(i);
- final int newPos = mAdapter.getItemPosition(ii.object);
-
- if (newPos == PagerAdapter.POSITION_UNCHANGED) {
- continue;
- }
-
- if (newPos == PagerAdapter.POSITION_NONE) {
- mItems.remove(i);
- i--;
-
- if (!isUpdating) {
- mAdapter.startUpdate(this);
- isUpdating = true;
- }
-
- mAdapter.destroyItem(this, ii.position, ii.object);
- needPopulate = true;
-
- if (mCurItem == ii.position) {
- // Keep the current item in the valid range
- newCurrItem = Math.max(0, Math.min(mCurItem, adapterCount - 1));
- needPopulate = true;
- }
- continue;
- }
-
- if (ii.position != newPos) {
- if (ii.position == mCurItem) {
- // Our current item changed position. Follow it.
- newCurrItem = newPos;
- }
-
- ii.position = newPos;
- needPopulate = true;
- }
- }
-
- if (isUpdating) {
- mAdapter.finishUpdate(this);
- }
-
- Collections.sort(mItems, COMPARATOR);
-
- if (needPopulate) {
- // Reset our known page widths; populate will recompute them.
- final int childCount = getChildCount();
- for (int i = 0; i < childCount; i++) {
- final View child = getChildAt(i);
- final LayoutParams lp = (LayoutParams) child.getLayoutParams();
- if (!lp.isDecor) {
- lp.widthFactor = 0.f;
- }
- }
-
- setCurrentItemInternal(newCurrItem, false, true);
- requestLayout();
- }
- }
-
- void populate() {
- populate(mCurItem);
- }
-
- void populate(int newCurrentItem) {
- ItemInfo oldCurInfo = null;
- int focusDirection = View.FOCUS_FORWARD;
- if (mCurItem != newCurrentItem) {
- focusDirection = mCurItem < newCurrentItem ? View.FOCUS_RIGHT : View.FOCUS_LEFT;
- oldCurInfo = infoForPosition(mCurItem);
- mCurItem = newCurrentItem;
- }
-
- if (mAdapter == null) {
- sortChildDrawingOrder();
- return;
- }
-
- // Bail now if we are waiting to populate. This is to hold off
- // on creating views from the time the user releases their finger to
- // fling to a new position until we have finished the scroll to
- // that position, avoiding glitches from happening at that point.
- if (mPopulatePending) {
- if (DEBUG) Log.i(TAG, "populate is pending, skipping for now...");
- sortChildDrawingOrder();
- return;
- }
-
- // Also, don't populate until we are attached to a window. This is to
- // avoid trying to populate before we have restored our view hierarchy
- // state and conflicting with what is restored.
- if (getWindowToken() == null) {
- return;
- }
-
- mAdapter.startUpdate(this);
-
- final int pageLimit = mOffscreenPageLimit;
- final int startPos = Math.max(0, mCurItem - pageLimit);
- final int N = mAdapter.getCount();
- final int endPos = Math.min(N-1, mCurItem + pageLimit);
-
- if (N != mExpectedAdapterCount) {
- String resName;
- try {
- resName = getResources().getResourceName(getId());
- } catch (Resources.NotFoundException e) {
- resName = Integer.toHexString(getId());
- }
- throw new IllegalStateException("The application's PagerAdapter changed the adapter's" +
- " contents without calling PagerAdapter#notifyDataSetChanged!" +
- " Expected adapter item count: " + mExpectedAdapterCount + ", found: " + N +
- " Pager id: " + resName +
- " Pager class: " + getClass() +
- " Problematic adapter: " + mAdapter.getClass());
- }
-
- // Locate the currently focused item or add it if needed.
- int curIndex = -1;
- ItemInfo curItem = null;
- for (curIndex = 0; curIndex < mItems.size(); curIndex++) {
- final ItemInfo ii = mItems.get(curIndex);
- if (ii.position >= mCurItem) {
- if (ii.position == mCurItem) curItem = ii;
- break;
- }
- }
-
- if (curItem == null && N > 0) {
- curItem = addNewItem(mCurItem, curIndex);
- }
-
- // Fill 3x the available width or up to the number of offscreen
- // pages requested to either side, whichever is larger.
- // If we have no current item we have no work to do.
- if (curItem != null) {
- float extraWidthLeft = 0.f;
- int itemIndex = curIndex - 1;
- ItemInfo ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
- final int clientWidth = getClientWidth();
- final float leftWidthNeeded = clientWidth <= 0 ? 0 :
- 2.f - curItem.widthFactor + (float) getPaddingLeft() / (float) clientWidth;
- for (int pos = mCurItem - 1; pos >= 0; pos--) {
- if (extraWidthLeft >= leftWidthNeeded && pos < startPos) {
- if (ii == null) {
- break;
- }
- if (pos == ii.position && !ii.scrolling) {
- mItems.remove(itemIndex);
- mAdapter.destroyItem(this, pos, ii.object);
- if (DEBUG) {
- Log.i(TAG, "populate() - destroyItem() with pos: " + pos +
- " view: " + ((View) ii.object));
- }
- itemIndex--;
- curIndex--;
- ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
- }
- } else if (ii != null && pos == ii.position) {
- extraWidthLeft += ii.widthFactor;
- itemIndex--;
- ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
- } else {
- ii = addNewItem(pos, itemIndex + 1);
- extraWidthLeft += ii.widthFactor;
- curIndex++;
- ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
- }
- }
-
- float extraWidthRight = curItem.widthFactor;
- itemIndex = curIndex + 1;
- if (extraWidthRight < 2.f) {
- ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
- final float rightWidthNeeded = clientWidth <= 0 ? 0 :
- (float) getPaddingRight() / (float) clientWidth + 2.f;
- for (int pos = mCurItem + 1; pos < N; pos++) {
- if (extraWidthRight >= rightWidthNeeded && pos > endPos) {
- if (ii == null) {
- break;
- }
- if (pos == ii.position && !ii.scrolling) {
- mItems.remove(itemIndex);
- mAdapter.destroyItem(this, pos, ii.object);
- if (DEBUG) {
- Log.i(TAG, "populate() - destroyItem() with pos: " + pos +
- " view: " + ((View) ii.object));
- }
- ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
- }
- } else if (ii != null && pos == ii.position) {
- extraWidthRight += ii.widthFactor;
- itemIndex++;
- ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
- } else {
- ii = addNewItem(pos, itemIndex);
- itemIndex++;
- extraWidthRight += ii.widthFactor;
- ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
- }
- }
- }
-
- calculatePageOffsets(curItem, curIndex, oldCurInfo);
- }
-
- if (DEBUG) {
- Log.i(TAG, "Current page list:");
- for (int i=0; i();
- } else {
- mDrawingOrderedChildren.clear();
- }
- final int childCount = getChildCount();
- for (int i = 0; i < childCount; i++) {
- final View child = getChildAt(i);
- mDrawingOrderedChildren.add(child);
- }
- Collections.sort(mDrawingOrderedChildren, sPositionComparator);
- }
- }
-
- private void calculatePageOffsets(ItemInfo curItem, int curIndex, ItemInfo oldCurInfo) {
- final int N = mAdapter.getCount();
- final int width = getClientWidth();
- final float marginOffset = width > 0 ? (float) mPageMargin / width : 0;
- // Fix up offsets for later layout.
- if (oldCurInfo != null) {
- final int oldCurPosition = oldCurInfo.position;
- // Base offsets off of oldCurInfo.
- if (oldCurPosition < curItem.position) {
- int itemIndex = 0;
- ItemInfo ii = null;
- float offset = oldCurInfo.offset + oldCurInfo.widthFactor + marginOffset;
- for (int pos = oldCurPosition + 1;
- pos <= curItem.position && itemIndex < mItems.size(); pos++) {
- ii = mItems.get(itemIndex);
- while (pos > ii.position && itemIndex < mItems.size() - 1) {
- itemIndex++;
- ii = mItems.get(itemIndex);
- }
- while (pos < ii.position) {
- // We don't have an item populated for this,
- // ask the adapter for an offset.
- offset += mAdapter.getPageWidth(pos) + marginOffset;
- pos++;
- }
- ii.offset = offset;
- offset += ii.widthFactor + marginOffset;
- }
- } else if (oldCurPosition > curItem.position) {
- int itemIndex = mItems.size() - 1;
- ItemInfo ii = null;
- float offset = oldCurInfo.offset;
- for (int pos = oldCurPosition - 1;
- pos >= curItem.position && itemIndex >= 0; pos--) {
- ii = mItems.get(itemIndex);
- while (pos < ii.position && itemIndex > 0) {
- itemIndex--;
- ii = mItems.get(itemIndex);
- }
- while (pos > ii.position) {
- // We don't have an item populated for this,
- // ask the adapter for an offset.
- offset -= mAdapter.getPageWidth(pos) + marginOffset;
- pos--;
- }
- offset -= ii.widthFactor + marginOffset;
- ii.offset = offset;
- }
- }
- }
-
- // Base all offsets off of curItem.
- final int itemCount = mItems.size();
- float offset = curItem.offset;
- int pos = curItem.position - 1;
- mFirstOffset = curItem.position == 0 ? curItem.offset : -Float.MAX_VALUE;
- mLastOffset = curItem.position == N - 1 ?
- curItem.offset + curItem.widthFactor - 1 : Float.MAX_VALUE;
- // Previous pages
- for (int i = curIndex - 1; i >= 0; i--, pos--) {
- final ItemInfo ii = mItems.get(i);
- while (pos > ii.position) {
- offset -= mAdapter.getPageWidth(pos--) + marginOffset;
- }
- offset -= ii.widthFactor + marginOffset;
- ii.offset = offset;
- if (ii.position == 0) mFirstOffset = offset;
- }
- offset = curItem.offset + curItem.widthFactor + marginOffset;
- pos = curItem.position + 1;
- // Next pages
- for (int i = curIndex + 1; i < itemCount; i++, pos++) {
- final ItemInfo ii = mItems.get(i);
- while (pos < ii.position) {
- offset += mAdapter.getPageWidth(pos++) + marginOffset;
- }
- if (ii.position == N - 1) {
- mLastOffset = offset + ii.widthFactor - 1;
- }
- ii.offset = offset;
- offset += ii.widthFactor + marginOffset;
- }
-
- mNeedCalculatePageOffsets = false;
- }
-
- /**
- * This is the persistent state that is saved by ViewPager. Only needed
- * if you are creating a sublass of ViewPager that must save its own
- * state, in which case it should implement a subclass of this which
- * contains that state.
- */
- public static class SavedState extends BaseSavedState {
- int position;
- Parcelable adapterState;
- ClassLoader loader;
-
- public SavedState(Parcelable superState) {
- super(superState);
- }
-
- @Override
- public void writeToParcel(Parcel out, int flags) {
- super.writeToParcel(out, flags);
- out.writeInt(position);
- out.writeParcelable(adapterState, flags);
- }
-
- @Override
- public String toString() {
- return "FragmentPager.SavedState{"
- + Integer.toHexString(System.identityHashCode(this))
- + " position=" + position + "}";
- }
-
- public static final Parcelable.Creator CREATOR
- = new Parcelable.Creator() {
- public SavedState createFromParcel(Parcel in) {
- return new SavedState(in);
- }
- public SavedState[] newArray(int size) {
- return new SavedState[size];
- }
- };
-
- SavedState(Parcel in) {
- super(in);
- loader = getClass().getClassLoader();
- position = in.readInt();
- adapterState = in.readParcelable(loader);
- this.loader = loader;
- }
- }
-
- @Override
- public Parcelable onSaveInstanceState() {
- Parcelable superState = super.onSaveInstanceState();
- SavedState ss = new SavedState(superState);
- ss.position = mCurItem;
- if (mAdapter != null) {
- ss.adapterState = mAdapter.saveState();
- }
- return ss;
- }
-
- @Override
- public void onRestoreInstanceState(Parcelable state) {
- if (!(state instanceof SavedState)) {
- super.onRestoreInstanceState(state);
- return;
- }
-
- SavedState ss = (SavedState)state;
- super.onRestoreInstanceState(ss.getSuperState());
-
- if (mAdapter != null) {
- mAdapter.restoreState(ss.adapterState, ss.loader);
- setCurrentItemInternal(ss.position, false, true);
- } else {
- mRestoredCurItem = ss.position;
- mRestoredAdapterState = ss.adapterState;
- mRestoredClassLoader = ss.loader;
- }
- }
-
- @Override
- public void addView(View child, int index, ViewGroup.LayoutParams params) {
- if (!checkLayoutParams(params)) {
- params = generateLayoutParams(params);
- }
- final LayoutParams lp = (LayoutParams) params;
- lp.isDecor |= child instanceof Decor;
- if (mInLayout) {
- if (lp != null && lp.isDecor) {
- throw new IllegalStateException("Cannot add pager decor view during layout");
- }
- lp.needsMeasure = true;
- addViewInLayout(child, index, params);
- } else {
- super.addView(child, index, params);
- }
-
- if (USE_CACHE) {
- if (child.getVisibility() != GONE) {
- child.setDrawingCacheEnabled(mScrollingCacheEnabled);
- } else {
- child.setDrawingCacheEnabled(false);
- }
- }
- }
-
- @Override
- public void removeView(View view) {
- if (mInLayout) {
- removeViewInLayout(view);
- } else {
- super.removeView(view);
- }
- }
-
- ItemInfo infoForChild(View child) {
- for (int i=0; i 0 && !mItems.isEmpty()) {
- final int widthWithMargin = width - getPaddingLeft() - getPaddingRight() + margin;
- final int oldWidthWithMargin = oldWidth - getPaddingLeft() - getPaddingRight()
- + oldMargin;
- final int xpos = getScrollX();
- final float pageOffset = (float) xpos / oldWidthWithMargin;
- final int newOffsetPixels = (int) (pageOffset * widthWithMargin);
-
- scrollTo(newOffsetPixels, getScrollY());
- if (!mScroller.isFinished()) {
- // We now return to your regularly scheduled scroll, already in progress.
- final int newDuration = mScroller.getDuration() - mScroller.timePassed();
- ItemInfo targetInfo = infoForPosition(mCurItem);
- mScroller.startScroll(newOffsetPixels, 0,
- (int) (targetInfo.offset * width), 0, newDuration);
- }
- } else {
- final ItemInfo ii = infoForPosition(mCurItem);
- final float scrollOffset = ii != null ? Math.min(ii.offset, mLastOffset) : 0;
- final int scrollPos = (int) (scrollOffset *
- (width - getPaddingLeft() - getPaddingRight()));
- if (scrollPos != getScrollX()) {
- completeScroll(false);
- scrollTo(scrollPos, getScrollY());
- }
- }
- }
-
- @Override
- protected void onLayout(boolean changed, int l, int t, int r, int b) {
- final int count = getChildCount();
- int width = r - l;
- int height = b - t;
- int paddingLeft = getPaddingLeft();
- int paddingTop = getPaddingTop();
- int paddingRight = getPaddingRight();
- int paddingBottom = getPaddingBottom();
- final int scrollX = getScrollX();
-
- int decorCount = 0;
-
- // First pass - decor views. We need to do this in two passes so that
- // we have the proper offsets for non-decor views later.
- for (int i = 0; i < count; i++) {
- final View child = getChildAt(i);
- if (child.getVisibility() != GONE) {
- final LayoutParams lp = (LayoutParams) child.getLayoutParams();
- int childLeft = 0;
- int childTop = 0;
- if (lp.isDecor) {
- final int hgrav = lp.gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
- final int vgrav = lp.gravity & Gravity.VERTICAL_GRAVITY_MASK;
- switch (hgrav) {
- default:
- childLeft = paddingLeft;
- break;
- case Gravity.LEFT:
- childLeft = paddingLeft;
- paddingLeft += child.getMeasuredWidth();
- break;
- case Gravity.CENTER_HORIZONTAL:
- childLeft = Math.max((width - child.getMeasuredWidth()) / 2,
- paddingLeft);
- break;
- case Gravity.RIGHT:
- childLeft = width - paddingRight - child.getMeasuredWidth();
- paddingRight += child.getMeasuredWidth();
- break;
- }
- switch (vgrav) {
- default:
- childTop = paddingTop;
- break;
- case Gravity.TOP:
- childTop = paddingTop;
- paddingTop += child.getMeasuredHeight();
- break;
- case Gravity.CENTER_VERTICAL:
- childTop = Math.max((height - child.getMeasuredHeight()) / 2,
- paddingTop);
- break;
- case Gravity.BOTTOM:
- childTop = height - paddingBottom - child.getMeasuredHeight();
- paddingBottom += child.getMeasuredHeight();
- break;
- }
- childLeft += scrollX;
- child.layout(childLeft, childTop,
- childLeft + child.getMeasuredWidth(),
- childTop + child.getMeasuredHeight());
- decorCount++;
- }
- }
- }
-
- final int childWidth = width - paddingLeft - paddingRight;
- // Page views. Do this once we have the right padding offsets from above.
- for (int i = 0; i < count; i++) {
- final View child = getChildAt(i);
- if (child.getVisibility() != GONE) {
- final LayoutParams lp = (LayoutParams) child.getLayoutParams();
- ItemInfo ii;
- if (!lp.isDecor && (ii = infoForChild(child)) != null) {
- int loff = (int) (childWidth * ii.offset);
- int childLeft = paddingLeft + loff;
- int childTop = paddingTop;
- if (lp.needsMeasure) {
- // This was added during layout and needs measurement.
- // Do it now that we know what we're working with.
- lp.needsMeasure = false;
- final int widthSpec = MeasureSpec.makeMeasureSpec(
- (int) (childWidth * lp.widthFactor),
- MeasureSpec.EXACTLY);
- final int heightSpec = MeasureSpec.makeMeasureSpec(
- (int) (height - paddingTop - paddingBottom),
- MeasureSpec.EXACTLY);
- child.measure(widthSpec, heightSpec);
- }
- if (DEBUG) Log.v(TAG, "Positioning #" + i + " " + child + " f=" + ii.object
- + ":" + childLeft + "," + childTop + " " + child.getMeasuredWidth()
- + "x" + child.getMeasuredHeight());
- child.layout(childLeft, childTop,
- childLeft + child.getMeasuredWidth(),
- childTop + child.getMeasuredHeight());
- }
- }
- }
- mTopPageBounds = paddingTop;
- mBottomPageBounds = height - paddingBottom;
- mDecorChildCount = decorCount;
-
- if (mFirstLayout) {
- scrollToItem(mCurItem, false, 0, false);
- }
- mFirstLayout = false;
- }
-
- @Override
- public void computeScroll() {
- if (!mScroller.isFinished() && mScroller.computeScrollOffset()) {
- int oldX = getScrollX();
- int oldY = getScrollY();
- int x = mScroller.getCurrX();
- int y = mScroller.getCurrY();
-
- if (oldX != x || oldY != y) {
- scrollTo(x, y);
- if (!pageScrolled(x)) {
- mScroller.abortAnimation();
- scrollTo(0, y);
- }
- }
-
- // Keep on drawing until the animation has finished.
- ViewPagerIcsCompat.postInvalidateOnAnimation(this);
- return;
- }
-
- // Done with scroll, clean up state.
- completeScroll(true);
- }
-
- private boolean pageScrolled(int xpos) {
- if (mItems.size() == 0) {
- mCalledSuper = false;
- onPageScrolled(0, 0, 0);
- if (!mCalledSuper) {
- throw new IllegalStateException(
- "onPageScrolled did not call superclass implementation");
- }
- return false;
- }
- final ItemInfo ii = infoForCurrentScrollPosition();
- final int width = getClientWidth();
- final int widthWithMargin = width + mPageMargin;
- final float marginOffset = (float) mPageMargin / width;
- final int currentPage = ii.position;
- final float pageOffset = (((float) xpos / width) - ii.offset) /
- (ii.widthFactor + marginOffset);
- final int offsetPixels = (int) (pageOffset * widthWithMargin);
-
- mCalledSuper = false;
- onPageScrolled(currentPage, pageOffset, offsetPixels);
- if (!mCalledSuper) {
- throw new IllegalStateException(
- "onPageScrolled did not call superclass implementation");
- }
- return true;
- }
-
- /**
- * This method will be invoked when the current page is scrolled, either as part
- * of a programmatically initiated smooth scroll or a user initiated touch scroll.
- * If you override this method you must call through to the superclass implementation
- * (e.g. super.onPageScrolled(position, offset, offsetPixels)) before onPageScrolled
- * returns.
- *
- * @param position Position index of the first page currently being displayed.
- * Page position+1 will be visible if positionOffset is nonzero.
- * @param offset Value from [0, 1) indicating the offset from the page at position.
- * @param offsetPixels Value in pixels indicating the offset from position.
- */
- protected void onPageScrolled(int position, float offset, int offsetPixels) {
- // Offset any decor views if needed - keep them on-screen at all times.
- if (mDecorChildCount > 0) {
- final int scrollX = getScrollX();
- int paddingLeft = getPaddingLeft();
- int paddingRight = getPaddingRight();
- final int width = getWidth();
- final int childCount = getChildCount();
- for (int i = 0; i < childCount; i++) {
- final View child = getChildAt(i);
- final LayoutParams lp = (LayoutParams) child.getLayoutParams();
- if (!lp.isDecor) continue;
-
- final int hgrav = lp.gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
- int childLeft = 0;
- switch (hgrav) {
- default:
- childLeft = paddingLeft;
- break;
- case Gravity.LEFT:
- childLeft = paddingLeft;
- paddingLeft += child.getWidth();
- break;
- case Gravity.CENTER_HORIZONTAL:
- childLeft = Math.max((width - child.getMeasuredWidth()) / 2,
- paddingLeft);
- break;
- case Gravity.RIGHT:
- childLeft = width - paddingRight - child.getMeasuredWidth();
- paddingRight += child.getMeasuredWidth();
- break;
- }
- childLeft += scrollX;
-
- final int childOffset = childLeft - child.getLeft();
- if (childOffset != 0) {
- child.offsetLeftAndRight(childOffset);
- }
- }
- }
-
- dispatchOnPageScrolled(position, offset, offsetPixels);
-
- if (mPageTransformer != null) {
- final int scrollX = getScrollX();
- final int childCount = getChildCount();
- for (int i = 0; i < childCount; i++) {
- final View child = getChildAt(i);
- final LayoutParams lp = (LayoutParams) child.getLayoutParams();
-
- if (lp.isDecor) continue;
-
- final float transformPos = (float) (child.getLeft() - scrollX) / getClientWidth();
- mPageTransformer.transformPage(child, transformPos);
- }
- }
-
- mCalledSuper = true;
- }
-
- private void dispatchOnPageScrolled(int position, float offset, int offsetPixels) {
- if (mOnPageChangeListener != null) {
- mOnPageChangeListener.onPageScrolled(position, offset, offsetPixels);
- }
- if (mOnPageChangeListeners != null) {
- for (int i = 0, z = mOnPageChangeListeners.size(); i < z; i++) {
- OnPageChangeListener listener = mOnPageChangeListeners.get(i);
- if (listener != null) {
- listener.onPageScrolled(position, offset, offsetPixels);
- }
- }
- }
- if (mInternalPageChangeListener != null) {
- mInternalPageChangeListener.onPageScrolled(position, offset, offsetPixels);
- }
- }
-
- private void dispatchOnPageSelected(int position) {
- if (mOnPageChangeListener != null) {
- mOnPageChangeListener.onPageSelected(position);
- }
- if (mOnPageChangeListeners != null) {
- for (int i = 0, z = mOnPageChangeListeners.size(); i < z; i++) {
- OnPageChangeListener listener = mOnPageChangeListeners.get(i);
- if (listener != null) {
- listener.onPageSelected(position);
- }
- }
- }
- if (mInternalPageChangeListener != null) {
- mInternalPageChangeListener.onPageSelected(position);
- }
- }
-
- private void dispatchOnScrollStateChanged(int state) {
- if (mOnPageChangeListener != null) {
- mOnPageChangeListener.onPageScrollStateChanged(state);
- }
- if (mOnPageChangeListeners != null) {
- for (int i = 0, z = mOnPageChangeListeners.size(); i < z; i++) {
- OnPageChangeListener listener = mOnPageChangeListeners.get(i);
- if (listener != null) {
- listener.onPageScrollStateChanged(state);
- }
- }
- }
- if (mInternalPageChangeListener != null) {
- mInternalPageChangeListener.onPageScrollStateChanged(state);
- }
- }
-
- private void completeScroll(boolean postEvents) {
- boolean needPopulate = mScrollState == SCROLL_STATE_SETTLING;
- if (needPopulate) {
- // Done with scroll, no longer want to cache view drawing.
- setScrollingCacheEnabled(false);
- mScroller.abortAnimation();
- int oldX = getScrollX();
- int oldY = getScrollY();
- int x = mScroller.getCurrX();
- int y = mScroller.getCurrY();
- if (oldX != x || oldY != y) {
- scrollTo(x, y);
- if (x != oldX) {
- pageScrolled(x);
- }
- }
- }
- mPopulatePending = false;
- for (int i=0; i 0) || (x > getWidth() - mGutterSize && dx < 0);
- }
-
- private void enableLayers(boolean enable) {
- final int childCount = getChildCount();
- for (int i = 0; i < childCount; i++) {
- final int layerType = enable ?
- View.LAYER_TYPE_HARDWARE : View.LAYER_TYPE_NONE;
- getChildAt(i).setLayerType(layerType, null);
- }
- }
-
- @Override
- public boolean onInterceptTouchEvent(MotionEvent ev) {
- /*
- * This method JUST determines whether we want to intercept the motion.
- * If we return true, onMotionEvent will be called and we do the actual
- * scrolling there.
- */
-
- final int action = ev.getAction() & MotionEvent.ACTION_MASK;
-
- // Always take care of the touch gesture being complete.
- if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
- // Release the drag.
- if (DEBUG) Log.v(TAG, "Intercept done!");
- mIsBeingDragged = false;
- mIsUnableToDrag = false;
- mActivePointerId = INVALID_POINTER;
- if (mVelocityTracker != null) {
- mVelocityTracker.recycle();
- mVelocityTracker = null;
- }
- return false;
- }
-
- // Nothing more to do here if we have decided whether or not we
- // are dragging.
- if (action != MotionEvent.ACTION_DOWN) {
- if (mIsBeingDragged) {
- if (DEBUG) Log.v(TAG, "Intercept returning true!");
- return true;
- }
- if (mIsUnableToDrag) {
- if (DEBUG) Log.v(TAG, "Intercept returning false!");
- return false;
- }
- }
-
- switch (action) {
- case MotionEvent.ACTION_MOVE: {
- /*
- * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
- * whether the user has moved far enough from his original down touch.
- */
-
- /*
- * Locally do absolute value. mLastMotionY is set to the y value
- * of the down event.
- */
- final int activePointerId = mActivePointerId;
- if (activePointerId == INVALID_POINTER) {
- // If we don't have a valid id, the touch down wasn't on content.
- break;
- }
-
- final int pointerIndex = ev.findPointerIndex(activePointerId);
- final float x = ev.getX(pointerIndex);
- final float dx = x - mLastMotionX;
- final float xDiff = Math.abs(dx);
- final float y = ev.getY(pointerIndex);
- final float yDiff = Math.abs(y - mInitialMotionY);
- if (DEBUG) Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
-
- if (dx != 0 && !isGutterDrag(mLastMotionX, dx) &&
- canScroll(this, false, (int) dx, (int) x, (int) y)) {
- // Nested view has scrollable area under this point. Let it be handled there.
- mLastMotionX = x;
- mLastMotionY = y;
- mIsUnableToDrag = true;
- return false;
- }
- if (xDiff > mTouchSlop && xDiff * 0.5f > yDiff) {
- if (DEBUG) Log.v(TAG, "Starting drag!");
- mIsBeingDragged = true;
- requestParentDisallowInterceptTouchEvent(true);
- setScrollState(SCROLL_STATE_DRAGGING);
- mLastMotionX = dx > 0 ? mInitialMotionX + mTouchSlop :
- mInitialMotionX - mTouchSlop;
- mLastMotionY = y;
- setScrollingCacheEnabled(true);
- } else if (yDiff > mTouchSlop) {
- // The finger has moved enough in the vertical
- // direction to be counted as a drag... abort
- // any attempt to drag horizontally, to work correctly
- // with children that have scrolling containers.
- if (DEBUG) Log.v(TAG, "Starting unable to drag!");
- mIsUnableToDrag = true;
- }
- if (mIsBeingDragged) {
- // Scroll to follow the motion event
- if (performDrag(x)) {
- ViewPagerIcsCompat.postInvalidateOnAnimation(this);
- }
- }
- break;
- }
-
- case MotionEvent.ACTION_DOWN: {
- /*
- * Remember location of down touch.
- * ACTION_DOWN always refers to pointer index 0.
- */
- mLastMotionX = mInitialMotionX = ev.getX();
- mLastMotionY = mInitialMotionY = ev.getY();
- mActivePointerId = ev.getPointerId(0);
- mIsUnableToDrag = false;
-
- mScroller.computeScrollOffset();
- if (mScrollState == SCROLL_STATE_SETTLING &&
- Math.abs(mScroller.getFinalX() - mScroller.getCurrX()) > mCloseEnough) {
- // Let the user 'catch' the pager as it animates.
- mScroller.abortAnimation();
- mPopulatePending = false;
- populate();
- mIsBeingDragged = true;
- requestParentDisallowInterceptTouchEvent(true);
- setScrollState(SCROLL_STATE_DRAGGING);
- } else {
- completeScroll(false);
- mIsBeingDragged = false;
- }
-
- if (DEBUG) Log.v(TAG, "Down at " + mLastMotionX + "," + mLastMotionY
- + " mIsBeingDragged=" + mIsBeingDragged
- + "mIsUnableToDrag=" + mIsUnableToDrag);
- break;
- }
-
- case MotionEvent.ACTION_POINTER_UP:
- onSecondaryPointerUp(ev);
- break;
- }
-
- if (mVelocityTracker == null) {
- mVelocityTracker = VelocityTracker.obtain();
- }
- mVelocityTracker.addMovement(ev);
-
- /*
- * The only time we want to intercept motion events is if we are in the
- * drag mode.
- */
- return mIsBeingDragged;
- }
-
- @Override
- public boolean onTouchEvent(MotionEvent ev) {
- if (mFakeDragging) {
- // A fake drag is in progress already, ignore this real one
- // but still eat the touch events.
- // (It is likely that the user is multi-touching the screen.)
- return true;
- }
-
- if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
- // Don't handle edge touches immediately -- they may actually belong to one of our
- // descendants.
- return false;
- }
-
- if (mAdapter == null || mAdapter.getCount() == 0) {
- // Nothing to present or scroll; nothing to touch.
- return false;
- }
-
- if (mVelocityTracker == null) {
- mVelocityTracker = VelocityTracker.obtain();
- }
- mVelocityTracker.addMovement(ev);
-
- final int action = ev.getAction();
- boolean needsInvalidate = false;
-
- switch (action & MotionEvent.ACTION_MASK) {
- case MotionEvent.ACTION_DOWN: {
- mScroller.abortAnimation();
- mPopulatePending = false;
- populate();
-
- // Remember where the motion event started
- mLastMotionX = mInitialMotionX = ev.getX();
- mLastMotionY = mInitialMotionY = ev.getY();
- mActivePointerId = ev.getPointerId(0);
- break;
- }
- case MotionEvent.ACTION_MOVE:
- if (!mIsBeingDragged) {
- final int pointerIndex = ev.findPointerIndex(mActivePointerId);
- final float x = ev.getX(pointerIndex);
- final float xDiff = Math.abs(x - mLastMotionX);
- final float y = ev.getY(pointerIndex);
- final float yDiff = Math.abs(y - mLastMotionY);
- if (DEBUG) Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
- if (xDiff > mTouchSlop && xDiff > yDiff) {
- if (DEBUG) Log.v(TAG, "Starting drag!");
- mIsBeingDragged = true;
- requestParentDisallowInterceptTouchEvent(true);
- mLastMotionX = x - mInitialMotionX > 0 ? mInitialMotionX + mTouchSlop :
- mInitialMotionX - mTouchSlop;
- mLastMotionY = y;
- setScrollState(SCROLL_STATE_DRAGGING);
- setScrollingCacheEnabled(true);
-
- // Disallow Parent Intercept, just in case
- ViewParent parent = getParent();
- if (parent != null) {
- parent.requestDisallowInterceptTouchEvent(true);
- }
- }
- }
- // Not else! Note that mIsBeingDragged can be set above.
- if (mIsBeingDragged) {
- // Scroll to follow the motion event
- final int activePointerIndex = ev.findPointerIndex(mActivePointerId);
- final float x = ev.getX(activePointerIndex);
- needsInvalidate |= performDrag(x);
- }
- break;
- case MotionEvent.ACTION_UP:
- if (mIsBeingDragged) {
- final VelocityTracker velocityTracker = mVelocityTracker;
- velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
- int initialVelocity = (int) velocityTracker.getXVelocity(mActivePointerId);
- mPopulatePending = true;
- final int width = getClientWidth();
- final int scrollX = getScrollX();
- final ItemInfo ii = infoForCurrentScrollPosition();
- final int currentPage = ii.position;
- final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
- final int activePointerIndex =
- ev.findPointerIndex(mActivePointerId);
- final float x = ev.getX(activePointerIndex);
- final int totalDelta = (int) (x - mInitialMotionX);
- int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
- totalDelta);
- setCurrentItemInternal(nextPage, true, true, initialVelocity);
-
- mActivePointerId = INVALID_POINTER;
- endDrag();
- needsInvalidate = compatEdgeEffectOnRelease(mLeftEdge) | compatEdgeEffectOnRelease(mRightEdge);
- }
- break;
- case MotionEvent.ACTION_CANCEL:
- if (mIsBeingDragged) {
- scrollToItem(mCurItem, true, 0, false);
- mActivePointerId = INVALID_POINTER;
- endDrag();
- needsInvalidate = compatEdgeEffectOnRelease(mLeftEdge) | compatEdgeEffectOnRelease(mRightEdge);
- }
- break;
- case MotionEvent.ACTION_POINTER_DOWN: {
- final int index = ev.getActionIndex();
- final float x = ev.getX(index);
- mLastMotionX = x;
- mActivePointerId = ev.getPointerId(index);
- break;
- }
- case MotionEvent.ACTION_POINTER_UP:
- onSecondaryPointerUp(ev);
- mLastMotionX = ev.getX(ev.findPointerIndex(mActivePointerId));
- break;
- }
- if (needsInvalidate) {
- ViewPagerIcsCompat.postInvalidateOnAnimation(this);
- }
- return true;
- }
-
- // implements EdgeEffectCompatIcs's onRelease()
- private boolean compatEdgeEffectOnRelease(EdgeEffect eff) {
- eff.onRelease();
- return eff.isFinished();
- }
-
- private void requestParentDisallowInterceptTouchEvent(boolean disallowIntercept) {
- final ViewParent parent = getParent();
- if (parent != null) {
- parent.requestDisallowInterceptTouchEvent(disallowIntercept);
- }
- }
-
- private boolean performDrag(float x) {
- boolean needsInvalidate = false;
-
- final float deltaX = mLastMotionX - x;
- mLastMotionX = x;
-
- float oldScrollX = getScrollX();
- float scrollX = oldScrollX + deltaX;
- final int width = getClientWidth();
-
- float leftBound = width * mFirstOffset;
- float rightBound = width * mLastOffset;
- boolean leftAbsolute = true;
- boolean rightAbsolute = true;
-
- final ItemInfo firstItem = mItems.get(0);
- final ItemInfo lastItem = mItems.get(mItems.size() - 1);
- if (firstItem.position != 0) {
- leftAbsolute = false;
- leftBound = firstItem.offset * width;
- }
- if (lastItem.position != mAdapter.getCount() - 1) {
- rightAbsolute = false;
- rightBound = lastItem.offset * width;
- }
-
- if (scrollX < leftBound) {
- if (leftAbsolute) {
- float over = leftBound - scrollX;
- mLeftEdge.onPull(Math.abs(over) / width);
- needsInvalidate = true; // compat always returns true
- }
- scrollX = leftBound;
- } else if (scrollX > rightBound) {
- if (rightAbsolute) {
- float over = scrollX - rightBound;
- mRightEdge.onPull(Math.abs(over) / width);
- needsInvalidate = true; // compat always returns true
- }
- scrollX = rightBound;
- }
- // Don't lose the rounded component
- mLastMotionX += scrollX - (int) scrollX;
- scrollTo((int) scrollX, getScrollY());
- pageScrolled((int) scrollX);
-
- return needsInvalidate;
- }
-
- /**
- * @return Info about the page at the current scroll position.
- * This can be synthetic for a missing middle page; the 'object' field can be null.
- */
- private ItemInfo infoForCurrentScrollPosition() {
- final int width = getClientWidth();
- final float scrollOffset = width > 0 ? (float) getScrollX() / width : 0;
- final float marginOffset = width > 0 ? (float) mPageMargin / width : 0;
- int lastPos = -1;
- float lastOffset = 0.f;
- float lastWidth = 0.f;
- boolean first = true;
-
- ItemInfo lastItem = null;
- for (int i = 0; i < mItems.size(); i++) {
- ItemInfo ii = mItems.get(i);
- float offset;
- if (!first && ii.position != lastPos + 1) {
- // Create a synthetic item for a missing page.
- ii = mTempItem;
- ii.offset = lastOffset + lastWidth + marginOffset;
- ii.position = lastPos + 1;
- ii.widthFactor = mAdapter.getPageWidth(ii.position);
- i--;
- }
- offset = ii.offset;
-
- final float leftBound = offset;
- final float rightBound = offset + ii.widthFactor + marginOffset;
- if (first || scrollOffset >= leftBound) {
- if (scrollOffset < rightBound || i == mItems.size() - 1) {
- return ii;
- }
- } else {
- return lastItem;
- }
- first = false;
- lastPos = ii.position;
- lastOffset = offset;
- lastWidth = ii.widthFactor;
- lastItem = ii;
- }
-
- return lastItem;
- }
-
- private int determineTargetPage(int currentPage, float pageOffset, int velocity, int deltaX) {
- int targetPage;
- if (Math.abs(deltaX) > mFlingDistance && Math.abs(velocity) > mMinimumVelocity) {
- targetPage = velocity > 0 ? currentPage : currentPage + 1;
- } else {
- final float truncator = currentPage >= mCurItem ? 0.4f : 0.6f;
- targetPage = (int) (currentPage + pageOffset + truncator);
- }
-
- if (mItems.size() > 0) {
- final ItemInfo firstItem = mItems.get(0);
- final ItemInfo lastItem = mItems.get(mItems.size() - 1);
-
- // Only let the user target pages we have items for
- targetPage = Math.max(firstItem.position, Math.min(targetPage, lastItem.position));
- }
-
- return targetPage;
- }
-
- @Override
- public void draw(Canvas canvas) {
- super.draw(canvas);
- boolean needsInvalidate = false;
-
- final int overScrollMode = this.getOverScrollMode();
- if (overScrollMode == View.OVER_SCROLL_ALWAYS ||
- (overScrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS &&
- mAdapter != null && mAdapter.getCount() > 1)) {
- if (!mLeftEdge.isFinished()) {
- final int restoreCount = canvas.save();
- final int height = getHeight() - getPaddingTop() - getPaddingBottom();
- final int width = getWidth();
-
- canvas.rotate(270);
- canvas.translate(-height + getPaddingTop(), mFirstOffset * width);
- mLeftEdge.setSize(height, width);
- needsInvalidate |= mLeftEdge.draw(canvas);
- canvas.restoreToCount(restoreCount);
- }
- if (!mRightEdge.isFinished()) {
- final int restoreCount = canvas.save();
- final int width = getWidth();
- final int height = getHeight() - getPaddingTop() - getPaddingBottom();
-
- canvas.rotate(90);
- canvas.translate(-getPaddingTop(), -(mLastOffset + 1) * width);
- mRightEdge.setSize(height, width);
- needsInvalidate |= mRightEdge.draw(canvas);
- canvas.restoreToCount(restoreCount);
- }
- } else {
- mLeftEdge.finish();
- mRightEdge.finish();
- }
-
- if (needsInvalidate) {
- // Keep animating
- ViewPagerIcsCompat.postInvalidateOnAnimation(this);
- }
- }
-
- @Override
- protected void onDraw(Canvas canvas) {
- super.onDraw(canvas);
-
- // Draw the margin drawable between pages if needed.
- if (mPageMargin > 0 && mMarginDrawable != null && mItems.size() > 0 && mAdapter != null) {
- final int scrollX = getScrollX();
- final int width = getWidth();
-
- final float marginOffset = (float) mPageMargin / width;
- int itemIndex = 0;
- ItemInfo ii = mItems.get(0);
- float offset = ii.offset;
- final int itemCount = mItems.size();
- final int firstPos = ii.position;
- final int lastPos = mItems.get(itemCount - 1).position;
- for (int pos = firstPos; pos < lastPos; pos++) {
- while (pos > ii.position && itemIndex < itemCount) {
- ii = mItems.get(++itemIndex);
- }
-
- float drawAt;
- if (pos == ii.position) {
- drawAt = (ii.offset + ii.widthFactor) * width;
- offset = ii.offset + ii.widthFactor + marginOffset;
- } else {
- float widthFactor = mAdapter.getPageWidth(pos);
- drawAt = (offset + widthFactor) * width;
- offset += widthFactor + marginOffset;
- }
-
- if (drawAt + mPageMargin > scrollX) {
- mMarginDrawable.setBounds((int) drawAt, mTopPageBounds,
- (int) (drawAt + mPageMargin + 0.5f), mBottomPageBounds);
- mMarginDrawable.draw(canvas);
- }
-
- if (drawAt > scrollX + width) {
- break; // No more visible, no sense in continuing
- }
- }
- }
- }
-
- /**
- * Start a fake drag of the pager.
- *
- * A fake drag can be useful if you want to synchronize the motion of the ViewPager
- * with the touch scrolling of another view, while still letting the ViewPager
- * control the snapping motion and fling behavior. (e.g. parallax-scrolling tabs.)
- * Call {@link #fakeDragBy(float)} to simulate the actual drag motion. Call
- * {@link #endFakeDrag()} to complete the fake drag and fling as necessary.
- *
- *
During a fake drag the ViewPager will ignore all touch events. If a real drag
- * is already in progress, this method will return false.
- *
- * @return true if the fake drag began successfully, false if it could not be started.
- *
- * @see #fakeDragBy(float)
- * @see #endFakeDrag()
- */
- public boolean beginFakeDrag() {
- if (mIsBeingDragged) {
- return false;
- }
- mFakeDragging = true;
- setScrollState(SCROLL_STATE_DRAGGING);
- mInitialMotionX = mLastMotionX = 0;
- if (mVelocityTracker == null) {
- mVelocityTracker = VelocityTracker.obtain();
- } else {
- mVelocityTracker.clear();
- }
- final long time = SystemClock.uptimeMillis();
- final MotionEvent ev = MotionEvent.obtain(time, time, MotionEvent.ACTION_DOWN, 0, 0, 0);
- mVelocityTracker.addMovement(ev);
- ev.recycle();
- mFakeDragBeginTime = time;
- return true;
- }
-
- /**
- * End a fake drag of the pager.
- *
- * @see #beginFakeDrag()
- * @see #fakeDragBy(float)
- */
- public void endFakeDrag() {
- if (!mFakeDragging) {
- throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
- }
-
- final VelocityTracker velocityTracker = mVelocityTracker;
- velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
- int initialVelocity = (int) velocityTracker.getXVelocity(mActivePointerId);
- mPopulatePending = true;
- final int width = getClientWidth();
- final int scrollX = getScrollX();
- final ItemInfo ii = infoForCurrentScrollPosition();
- final int currentPage = ii.position;
- final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
- final int totalDelta = (int) (mLastMotionX - mInitialMotionX);
- int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
- totalDelta);
- setCurrentItemInternal(nextPage, true, true, initialVelocity);
- endDrag();
-
- mFakeDragging = false;
- }
-
- /**
- * Fake drag by an offset in pixels. You must have called {@link #beginFakeDrag()} first.
- *
- * @param xOffset Offset in pixels to drag by.
- * @see #beginFakeDrag()
- * @see #endFakeDrag()
- */
- public void fakeDragBy(float xOffset) {
- if (!mFakeDragging) {
- throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
- }
-
- mLastMotionX += xOffset;
-
- float oldScrollX = getScrollX();
- float scrollX = oldScrollX - xOffset;
- final int width = getClientWidth();
-
- float leftBound = width * mFirstOffset;
- float rightBound = width * mLastOffset;
-
- final ItemInfo firstItem = mItems.get(0);
- final ItemInfo lastItem = mItems.get(mItems.size() - 1);
- if (firstItem.position != 0) {
- leftBound = firstItem.offset * width;
- }
- if (lastItem.position != mAdapter.getCount() - 1) {
- rightBound = lastItem.offset * width;
- }
-
- if (scrollX < leftBound) {
- scrollX = leftBound;
- } else if (scrollX > rightBound) {
- scrollX = rightBound;
- }
- // Don't lose the rounded component
- mLastMotionX += scrollX - (int) scrollX;
- scrollTo((int) scrollX, getScrollY());
- pageScrolled((int) scrollX);
-
- // Synthesize an event for the VelocityTracker.
- final long time = SystemClock.uptimeMillis();
- final MotionEvent ev = MotionEvent.obtain(mFakeDragBeginTime, time, MotionEvent.ACTION_MOVE,
- mLastMotionX, 0, 0);
- mVelocityTracker.addMovement(ev);
- ev.recycle();
- }
-
- /**
- * Returns true if a fake drag is in progress.
- *
- * @return true if currently in a fake drag, false otherwise.
- *
- * @see #beginFakeDrag()
- * @see #fakeDragBy(float)
- * @see #endFakeDrag()
- */
- public boolean isFakeDragging() {
- return mFakeDragging;
- }
-
- private void onSecondaryPointerUp(MotionEvent ev) {
- final int pointerIndex = ev.getActionIndex();
- final int pointerId = ev.getPointerId(pointerIndex);
- if (pointerId == mActivePointerId) {
- // This was our active pointer going up. Choose a new
- // active pointer and adjust accordingly.
- final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
- mLastMotionX = ev.getX(newPointerIndex);
- mActivePointerId = ev.getPointerId(newPointerIndex);
- if (mVelocityTracker != null) {
- mVelocityTracker.clear();
- }
- }
- }
-
- private void endDrag() {
- mIsBeingDragged = false;
- mIsUnableToDrag = false;
-
- if (mVelocityTracker != null) {
- mVelocityTracker.recycle();
- mVelocityTracker = null;
- }
- }
-
- private void setScrollingCacheEnabled(boolean enabled) {
- if (mScrollingCacheEnabled != enabled) {
- mScrollingCacheEnabled = enabled;
- if (USE_CACHE) {
- final int size = getChildCount();
- for (int i = 0; i < size; ++i) {
- final View child = getChildAt(i);
- if (child.getVisibility() != GONE) {
- child.setDrawingCacheEnabled(enabled);
- }
- }
- }
- }
- }
-
- public boolean canScrollHorizontally(int direction) {
- if (mAdapter == null) {
- return false;
- }
-
- final int width = getClientWidth();
- final int scrollX = getScrollX();
- if (direction < 0) {
- return (scrollX > (int) (width * mFirstOffset));
- } else if (direction > 0) {
- return (scrollX < (int) (width * mLastOffset));
- } else {
- return false;
- }
- }
-
- /**
- * Tests scrollability within child views of v given a delta of dx.
- *
- * @param v View to test for horizontal scrollability
- * @param checkV Whether the view v passed should itself be checked for scrollability (true),
- * or just its children (false).
- * @param dx Delta scrolled in pixels
- * @param x X coordinate of the active touch point
- * @param y Y coordinate of the active touch point
- * @return true if child views of v can be scrolled by delta of dx.
- */
- protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
- if (v instanceof ViewGroup) {
- final ViewGroup group = (ViewGroup) v;
- final int scrollX = v.getScrollX();
- final int scrollY = v.getScrollY();
- final int count = group.getChildCount();
- // Count backwards - let topmost views consume scroll distance first.
- for (int i = count - 1; i >= 0; i--) {
- // TODO: Add versioned support here for transformed views.
- // This will not work for transformed views in Honeycomb+
- final View child = group.getChildAt(i);
- if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight() &&
- y + scrollY >= child.getTop() && y + scrollY < child.getBottom() &&
- canScroll(child, true, dx, x + scrollX - child.getLeft(),
- y + scrollY - child.getTop())) {
- return true;
- }
- }
- }
-
- return checkV && v.canScrollHorizontally(-dx);
- }
-
- @Override
- public boolean dispatchKeyEvent(KeyEvent event) {
- // Let the focused view and/or our descendants get the key first
- return super.dispatchKeyEvent(event) || executeKeyEvent(event);
- }
-
- /**
- * You can call this function yourself to have the scroll view perform
- * scrolling from a key event, just as if the event had been dispatched to
- * it by the view hierarchy.
- *
- * @param event The key event to execute.
- * @return Return true if the event was handled, else false.
- */
- public boolean executeKeyEvent(KeyEvent event) {
- boolean handled = false;
- if (event.getAction() == KeyEvent.ACTION_DOWN) {
- switch (event.getKeyCode()) {
- case KeyEvent.KEYCODE_DPAD_LEFT:
- handled = arrowScroll(FOCUS_LEFT);
- break;
- case KeyEvent.KEYCODE_DPAD_RIGHT:
- handled = arrowScroll(FOCUS_RIGHT);
- break;
- case KeyEvent.KEYCODE_TAB:
- if (Build.VERSION.SDK_INT >= 11) {
- // The focus finder had a bug handling FOCUS_FORWARD and FOCUS_BACKWARD
- // before Android 3.0. Ignore the tab key on those devices.
- if (event.hasNoModifiers()) {
- handled = arrowScroll(FOCUS_FORWARD);
- } else if (event.hasModifiers(KeyEvent.META_SHIFT_ON)) {
- handled = arrowScroll(FOCUS_BACKWARD);
- }
- }
- break;
- }
- }
- return handled;
- }
-
- public boolean arrowScroll(int direction) {
- View currentFocused = findFocus();
- if (currentFocused == this) {
- currentFocused = null;
- } else if (currentFocused != null) {
- boolean isChild = false;
- for (ViewParent parent = currentFocused.getParent(); parent instanceof ViewGroup;
- parent = parent.getParent()) {
- if (parent == this) {
- isChild = true;
- break;
- }
- }
- if (!isChild) {
- // This would cause the focus search down below to fail in fun ways.
- final StringBuilder sb = new StringBuilder();
- sb.append(currentFocused.getClass().getSimpleName());
- for (ViewParent parent = currentFocused.getParent(); parent instanceof ViewGroup;
- parent = parent.getParent()) {
- sb.append(" => ").append(parent.getClass().getSimpleName());
- }
- Log.e(TAG, "arrowScroll tried to find focus based on non-child " +
- "current focused view " + sb.toString());
- currentFocused = null;
- }
- }
-
- boolean handled = false;
-
- View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused,
- direction);
- if (nextFocused != null && nextFocused != currentFocused) {
- if (direction == View.FOCUS_LEFT) {
- // If there is nothing to the left, or this is causing us to
- // jump to the right, then what we really want to do is page left.
- final int nextLeft = getChildRectInPagerCoordinates(mTempRect, nextFocused).left;
- final int currLeft = getChildRectInPagerCoordinates(mTempRect, currentFocused).left;
- if (currentFocused != null && nextLeft >= currLeft) {
- handled = pageLeft();
- } else {
- handled = nextFocused.requestFocus();
- }
- } else if (direction == View.FOCUS_RIGHT) {
- // If there is nothing to the right, or this is causing us to
- // jump to the left, then what we really want to do is page right.
- final int nextLeft = getChildRectInPagerCoordinates(mTempRect, nextFocused).left;
- final int currLeft = getChildRectInPagerCoordinates(mTempRect, currentFocused).left;
- if (currentFocused != null && nextLeft <= currLeft) {
- handled = pageRight();
- } else {
- handled = nextFocused.requestFocus();
- }
- }
- } else if (direction == FOCUS_LEFT || direction == FOCUS_BACKWARD) {
- // Trying to move left and nothing there; try to page.
- handled = pageLeft();
- } else if (direction == FOCUS_RIGHT || direction == FOCUS_FORWARD) {
- // Trying to move right and nothing there; try to page.
- handled = pageRight();
- }
- if (handled) {
- playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction));
- }
- return handled;
- }
-
- private Rect getChildRectInPagerCoordinates(Rect outRect, View child) {
- if (outRect == null) {
- outRect = new Rect();
- }
- if (child == null) {
- outRect.set(0, 0, 0, 0);
- return outRect;
- }
- outRect.left = child.getLeft();
- outRect.right = child.getRight();
- outRect.top = child.getTop();
- outRect.bottom = child.getBottom();
-
- ViewParent parent = child.getParent();
- while (parent instanceof ViewGroup && parent != this) {
- final ViewGroup group = (ViewGroup) parent;
- outRect.left += group.getLeft();
- outRect.right += group.getRight();
- outRect.top += group.getTop();
- outRect.bottom += group.getBottom();
-
- parent = group.getParent();
- }
- return outRect;
- }
-
- boolean pageLeft() {
- if (mCurItem > 0) {
- setCurrentItem(mCurItem-1, true);
- return true;
- }
- return false;
- }
-
- boolean pageRight() {
- if (mAdapter != null && mCurItem < (mAdapter.getCount()-1)) {
- setCurrentItem(mCurItem+1, true);
- return true;
- }
- return false;
- }
-
- /**
- * We only want the current page that is being shown to be focusable.
- */
- @Override
- public void addFocusables(ArrayList views, int direction, int focusableMode) {
- final int focusableCount = views.size();
-
- final int descendantFocusability = getDescendantFocusability();
-
- if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) {
- for (int i = 0; i < getChildCount(); i++) {
- final View child = getChildAt(i);
- if (child.getVisibility() == VISIBLE) {
- ItemInfo ii = infoForChild(child);
- if (ii != null && ii.position == mCurItem) {
- child.addFocusables(views, direction, focusableMode);
- }
- }
- }
- }
-
- // we add ourselves (if focusable) in all cases except for when we are
- // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is
- // to avoid the focus search finding layouts when a more precise search
- // among the focusable children would be more interesting.
- if (
- descendantFocusability != FOCUS_AFTER_DESCENDANTS ||
- // No focusable descendants
- (focusableCount == views.size())) {
- // Note that we can't call the superclass here, because it will
- // add all views in. So we need to do the same thing View does.
- if (!isFocusable()) {
- return;
- }
- if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE &&
- isInTouchMode() && !isFocusableInTouchMode()) {
- return;
- }
- if (views != null) {
- views.add(this);
- }
- }
- }
-
- /**
- * We only want the current page that is being shown to be touchable.
- */
- @Override
- public void addTouchables(ArrayList views) {
- // Note that we don't call super.addTouchables(), which means that
- // we don't call View.addTouchables(). This is okay because a ViewPager
- // is itself not touchable.
- for (int i = 0; i < getChildCount(); i++) {
- final View child = getChildAt(i);
- if (child.getVisibility() == VISIBLE) {
- ItemInfo ii = infoForChild(child);
- if (ii != null && ii.position == mCurItem) {
- child.addTouchables(views);
- }
- }
- }
- }
-
- /**
- * We only want the current page that is being shown to be focusable.
- */
- @Override
- protected boolean onRequestFocusInDescendants(int direction,
- Rect previouslyFocusedRect) {
- int index;
- int increment;
- int end;
- int count = getChildCount();
- if ((direction & FOCUS_FORWARD) != 0) {
- index = 0;
- increment = 1;
- end = count;
- } else {
- index = count - 1;
- increment = -1;
- end = -1;
- }
- for (int i = index; i != end; i += increment) {
- View child = getChildAt(i);
- if (child.getVisibility() == VISIBLE) {
- ItemInfo ii = infoForChild(child);
- if (ii != null && ii.position == mCurItem) {
- if (child.requestFocus(direction, previouslyFocusedRect)) {
- return true;
- }
- }
- }
- }
- return false;
- }
-
- @Override
- public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
- // Dispatch scroll events from this ViewPager.
- if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
- return super.dispatchPopulateAccessibilityEvent(event);
- }
-
- // Dispatch all other accessibility events from the current page.
- final int childCount = getChildCount();
- for (int i = 0; i < childCount; i++) {
- final View child = getChildAt(i);
- if (child.getVisibility() == VISIBLE) {
- final ItemInfo ii = infoForChild(child);
- if (ii != null && ii.position == mCurItem &&
- child.dispatchPopulateAccessibilityEvent(event)) {
- return true;
- }
- }
- }
-
- return false;
- }
-
- @Override
- protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
- return new LayoutParams();
- }
-
- @Override
- protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
- return generateDefaultLayoutParams();
- }
-
- @Override
- protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
- return p instanceof LayoutParams && super.checkLayoutParams(p);
- }
-
- @Override
- public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
- return new LayoutParams(getContext(), attrs);
- }
-
- class MyAccessibilityDelegate extends AccessibilityDelegate {
-
- @Override
- public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
- super.onInitializeAccessibilityEvent(host, event);
- event.setClassName(ViewPager.class.getName());
- final AccessibilityRecord recordCompat = AccessibilityRecord.obtain();
- recordCompat.setScrollable(canScroll());
- if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED
- && mAdapter != null) {
- recordCompat.setItemCount(mAdapter.getCount());
- recordCompat.setFromIndex(mCurItem);
- recordCompat.setToIndex(mCurItem);
- }
- }
-
- @Override
- public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
- super.onInitializeAccessibilityNodeInfo(host, info);
- info.setClassName(ViewPager.class.getName());
- info.setScrollable(canScroll());
- if (canScrollHorizontally(1)) {
- info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
- }
- if (canScrollHorizontally(-1)) {
- info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
- }
- }
-
- @Override
- public boolean performAccessibilityAction(View host, int action, Bundle args) {
- if (super.performAccessibilityAction(host, action, args)) {
- return true;
- }
- switch (action) {
- case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: {
- if (canScrollHorizontally(1)) {
- setCurrentItem(mCurItem + 1);
- return true;
- }
- } return false;
- case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: {
- if (canScrollHorizontally(-1)) {
- setCurrentItem(mCurItem - 1);
- return true;
- }
- } return false;
- }
- return false;
- }
-
- private boolean canScroll() {
- return (mAdapter != null) && (mAdapter.getCount() > 1);
- }
- }
-
- private class PagerObserver extends DataSetObserver {
- @Override
- public void onChanged() {
- dataSetChanged();
- }
- @Override
- public void onInvalidated() {
- dataSetChanged();
- }
- }
-
- /**
- * Layout parameters that should be supplied for views added to a
- * ViewPager.
- */
- public static class LayoutParams extends ViewGroup.LayoutParams {
- /**
- * true if this view is a decoration on the pager itself and not
- * a view supplied by the adapter.
- */
- public boolean isDecor;
-
- /**
- * Gravity setting for use on decor views only:
- * Where to position the view page within the overall ViewPager
- * container; constants are defined in {@link android.view.Gravity}.
- */
- public int gravity;
-
- /**
- * Width as a 0-1 multiplier of the measured pager width
- */
- float widthFactor = 0.f;
-
- /**
- * true if this view was added during layout and needs to be measured
- * before being positioned.
- */
- boolean needsMeasure;
-
- /**
- * Adapter position this view is for if !isDecor
- */
- int position;
-
- /**
- * Current child index within the ViewPager that this view occupies
- */
- int childIndex;
-
- public LayoutParams() {
- super(FILL_PARENT, FILL_PARENT);
- }
-
- public LayoutParams(Context context, AttributeSet attrs) {
- super(context, attrs);
-
- final TypedArray a = context.obtainStyledAttributes(attrs, LAYOUT_ATTRS);
- gravity = a.getInteger(0, Gravity.TOP);
- a.recycle();
- }
- }
-
- static class ViewPositionComparator implements Comparator {
- @Override
- public int compare(View lhs, View rhs) {
- final LayoutParams llp = (LayoutParams) lhs.getLayoutParams();
- final LayoutParams rlp = (LayoutParams) rhs.getLayoutParams();
- if (llp.isDecor != rlp.isDecor) {
- return llp.isDecor ? 1 : -1;
- }
- return llp.position - rlp.position;
- }
- }
-}
diff --git a/app/src/main/java/android/support/v4/view/ViewPagerIcsCompat.java b/app/src/main/java/android/support/v4/view/ViewPagerIcsCompat.java
deleted file mode 100644
index b6b8698d..00000000
--- a/app/src/main/java/android/support/v4/view/ViewPagerIcsCompat.java
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * Copyright (C) 2011 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.support.v4.view;
-
-import android.os.Build;
-import android.view.View;
-
-
-/**
- * Bare bones compat library to support ICS (API level 15)
- * for Vanilla Music
- */
-public class ViewPagerIcsCompat {
- // From ViewPagerCompat
- private static final long FAKE_FRAME_TIME = 10;
-
- public static int getImportantForAccessibility(View view) {
- if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
- return view.getImportantForAccessibility();
- } else {
- return -1; // never returned by real implementation
- }
- }
-
- public static void postInvalidateOnAnimation(View view) {
- if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
- view.postInvalidateOnAnimation();
- } else {
- view.postInvalidateDelayed(FAKE_FRAME_TIME);
- }
- }
-
- public static void postOnAnimation(View view, Runnable action) {
- if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
- view.postOnAnimation(action);
- } else {
- view.postDelayed(action, FAKE_FRAME_TIME);
- }
- }
-}